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Full reference of LinkedIn answers 2023 for skill assessments (aws-lambda, rest-api, javascript, react, git, html, jquery, mongodb, java, Go, python, machine-learning, power-point) linkedin excel test lösungen, linkedin machine learning test LinkedIn test questions and answers

Home Page: https://ebazhanov.github.io/linkedin-skill-assessments-quizzes/

License: GNU Affero General Public License v3.0

linkedin quiz-questions answers assessment quiz linkedin-questions hacktoberfest hacktoberfest2020 exam skills

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linkedin-skill-assessments-quizzes's Issues

Couple of new questions to Machine Learning

Hello

I have a couple of questions I came across while giving a machine learning assessment and I could not find them here. Please let me know how can I help in updating the file

Q38. What prints to the console when this code is executed? C#

Just checked the C# code and the nearest correct answer is answer 3.

There is something wrong with the code. It will throw an error because you cant apply Inheritance to methos that way.

[*] an error, because the method signature of Login doesn't match the delegate

Lot of missing questions in the C++

Hi!
I just gave the LinkedIn assessment test, for C++; and a lot of questions were missing (hardly 1 - 2 questions were in this repositories), hence, opening this issue.
PS: I passed the 70th percentile.

Regards,
Tushar Nankani

AWS

Please upload this file for AWS. also you need to create a folder for AWS
aws.txt

JavaScript assessment question 11

The correct answer for the 11th question in the JavaScript Assessment is the 2nd answer not the 3rd.
Could you create me a branch to correct this issue and add new questions in Python and JavaScript assessment, please ?

Automatic question answer DATA

The more I look at the source code of the quiz still pages, the more I tell myself that it is possible to retrieve the questions and answers automatically. Indeed Linkedin has taken away our access to highlight the sentences and therefore impossible to copy and paste them. But serious to the source code I can copy and paste the questions and answers. The problem being that it still takes time and I think it's possible to automate it. Either with an Exel VBA macro or with a Python script or something else.

Here is some more information:

assessment-a11y-title (paragraph id withe title)
sa-assessment-quiz__title-detail (additional detail to the title)

sa-question-basic-multichoice__multiline (span with answer)
sa-question-multichoice__input (span answer)

MYSQL

Please add this questions for MYSQL

#### Q1. When you have a subquery inside of the main query, which query is executed first?
- [ ] The subquery is never executed. Only the main query is executed.
- [ ] They are executed at the same time
- [ ] the main query
- [ ] the subquery

#### Q2. You need to export the entire database, including the database objects, in addition to the data. Which command-line tool do you use?
- [ ] mysqlexport
- [ ] mysqladmin
- [ ] mysqldump
- [ ] mysqld

#### Q3. You must ensure the accuracy and reliability of the data in your database. You assign some constraints to limit the type of data that can go into a table. What type of constraints are you assigning?
- [ ] row level
- [ ] database level
- [ ] column level
- [ ] function leve

#### Q4. Which option of most MySQL command-line programs can be used to get a description of the program's different options?
- [ ] --options
- [ ] ?
- [ ] --help
- [ ] -h

#### Q5. MySQL uses environment variables in some of the programs and command-line operations. Which variable is used by the shell to find MySQL programs?
- [ ] DIR
- [ ] HOМЕ
- [ ] PATH
- [ ] MYSQL_HOME

#### Q6. How can you create a stored procedure in MySQL?
- [ ] `-`

1 CREATE PROCEDURE P () AS
2 BEGIN
3 END;

- [ ] `-`

1 CREATE PROCEDURE P ()
2 BEGIN
3 END

- [ ] `-`

1 CREATE PROCP
2 BEGIN
3 END;

- [ ] `-`

1 CREATE PROC P AS O
2 BEGIN
3 END;


#### Q7. If you were building a table schema to store student grades as a letter (A, B, C, D, or F) which column type would be the best choice?
- [ ] ENUM
- [ ] OTEXT
- [ ] VARCHAR
- [ ] LONGTEXT

#### Q8. Management has requested that you build an employee database. You start with the employee table. What is the correct syntax?
- [ ] `-`
1 CREATE TABLE employee (
2 employee ID char(10), 
3 firstName varchar(50), 
4 lastName varchar(50), 
5 phone varchar(20), 
6 address varchar(50), 
7 PRIMARY KEY ON employeeID 
8 );
- [ ] `-`
1 CREATE TABLE employee (
2 employee ID char(10), 
3 firstName varchar(50), 
4 lastName varchar(50), 
5 phone varchar(20),
6 address varchar(50), 
7 PRIMARY KEY employeeID 
8 );
- [ ] `-`
1 CREATE TABLE IF EXISTS employee ( 
2 employee ID char(10), 
3 firstName varchar(50), 
4 lastName varchar(50), 
5 phone varchar(20), 
6 address varchar(50), 
7 PRIMARY KEY (employeeID) 
8 );
- [ ] `-`
1 CREATE TABLE IF NOT EXISTS employee (
2 employee ID char(10), 
3 firstName varchar(50), 
4 lastName varchar(50), 
5 phone varchar(20), 
6 address varchar(50), 
7 PRIMARY KEY (employeeID) 
8 );

#### Q9. You are working with the tables as shown in this diagram. You need to generate the list of customers who purchased certain car models. Which SQL clause do you use?
- [ ] LIKE
- [x] IN
- [ ] BETWEEN
- [ ] HAVING

#### Q10. Which query would NOT be used to administer a MySQL server?
- [ ]  USE db
- [ ] SELECT column FROM tbl
- [ ] SHOW COLUMNS FROM tb1
- [ ] SHOW TABLES

#### Q11. What is the product of the database designing phase?
- [ ] system definition
- [ ] logical model
- [ ] physical model
- [ ] normalized database

#### Q12. MySQL server can operate in different SQL modes, depending on the value of the sql_mode system variable. Which mode changes syntax and behavior to conform more closely to standard SQL?
- [ ] TRADITIONAL
- [ ] ANSI
- [ ] MSSQL
- [ ] STRICT

#### Q13. MySQL programs are a set of command-line utilities that are provided with typical MySQL distributions. MySQL is designed to be a database.
- [ ] database and programming
- [ ] user and administrator
- [ ] client and server
- [ ] syntax and objects

#### Q14. Which MySQL command shows the structure of a table?
- [ ] INFO table;
- [ ] SHOW table;
- [ ]  STRUCTURE table;
- [ ]  DESCRIBE table;

#### Q15. MySQL uses security based on_____for all connections, queries, and other operations that users can attempt to perform.
- [ ]  administrator schema
- [ ] encrypted algorithms
- [ ] user settings
- [ ] access control lists

#### Q16. Which MySQL command modifies data records in a table?
- [ ] UPDATE
- [ ] MODIFY
- [ ] CHANGE
- [ ] ALTER

#### Q17. What is the best type of query for validating the format of an email address in a MySQL table?
- [ ] a SQL query using partitions
- [ ] a SQL query using IS NULL
- [ ] a SQL query using a regular expression
- [ ] a SQL query using LTRIM Or RTRIM

#### Q18. In MySQL, queries are always followed by what character?
- [ ] line break
- [ ] colon
- [ ] semicolon
- [ ] period

#### Q19. How can you remove a record using MySQL?
- [ ] DELETE
- [ ] DELETE FROM
- [ ] REMOVE
- [ ] REMOVE FROM

#### Q20. Which choice is NOT a statement you would use to filter data?
- [ ] GROUP_BY
- [ ] WHERE
- [ ] LIMIT
- [ ] LIKE

#### Q21. What does the following SQL statement return?
  `SELECT * FROM Employees WHERE EmployeeName LIKE 'a%'`
- [ ] It records in the Employees table where the value in the EmployeeName column doesn't have an "a".
- [ ] It records in the Employees table where the value in the EmployeeName column starts with "a".
- [ ] It records in the Employees table where the value in the EmployeeName column has an "a".
- [ ] It records in the Employees table where the value in the EmployeeName column ends with "a".

#### Q22. In `SELECT * FROM clients;` what does clients represent?
- [ ] a SQL query
- [ ] a SQL statement
- [ ] a database
- [ ] a table

#### Q23. How does MySQL differ from SQL?
- [ ] SQL is a standard language for retrieving and manipulating data from structured databases. MySQL is a nonrelational database management system that is used to manage SQL databases.
- [ ] SQL is a standard language for retrieving and manipulating data from structured databases. MySQL is a relational database management system that is used to manage SQL databases.
- [ ] They are not different. MySQL and SQL refer to the same thing.
- [ ] My SQL is a language, and SQL is a software application.

#### Q24. If you need to order a table of movies by name, which query will work?
- [ ] SELECT * FROM movies GROUP BY name
- [ ] SELECT * FROM movies ORDER BY name
- [ ] SELECT * FROM movies ORDER TABLE by name
- [ ] SELECT * FROM movies FILTER BY name

#### Q25. A trigger is a database object that is associated with a table, and that activates when a particular event occurs for the table. Which three events are these?
- [ ] INSERT, UPDATE, DELETE
- [ ] CREATE, ALTER, DROP
- [ ] OPEN, FETCH, CLOSE
- [ ] DECLARE, SET, SELECT

#### Q26. You are working with very large tables in your database. Which SQL clause do you use to prevent exceedingly large query results?
- [ ] UNIQUE
- [ ] LIMIT
- [ ] DISTINCT
- [ ] CONSTRAINT

#### Q27. What is the default port for MySQL Server?
- [ ] 25
- [ ] 990
- [ ] 0
- [ ] 3306

#### Q28. How can you filter duplicate data while retrieving records from a table?
- [ ] DISTINCT
- [ ] WHERE
- [ ] LIMIT
- [ ] AS

#### Q29. What is the difference between DROP and TRUNCATE?
- [ ] They both refer to the same operation of deleting the table completely.
- [ ] They both refer to the same operation of clearing the table, but keeping its definition intact.
- [ ] TRUNCATE deletes table completely, removing its definition as well. DROP clears the table but does not delete the definition.
- [ ] DROP deletes table completely, removing its definition as well. TRUNCATE clears the table but does not delete the definition.

#### Q30. How do you select every row in a given table named "inventory"?
- [ ] SELECT all FROM inventory;
- [ ] FROM inventory SELECT all;
- [ ] FROM inventory SELECT *;
- [ ] SELECT * FROM inventory;

#### Q31. In an efficiently designed relational database, what does every table have?
- [ ] set of triggers
- [ ] sequential id field
- [ ] minimum of three columns
- [ ] primary key

#### Q32. MySQL option files provide a way to specify commonly used options so that they need not be entered on the command line each time you run a program. What is another name for the option files?
- [ ] variable settings
- [ ] configuration files
- [ ] help files
- [ ] default settings

#### Q33. After installing MySQL, it may be necessary to initialize the __ which may be done automatically with some MySQL installation methods.
- [ ] storage engine
- [ ] user accounts
- [ ] grant tables
- [ ] data directory

Agile Methodologies -> One more question

Question:

What is the definition of capacity?

  • It is an inventory of the team's knowledge and skills that is used to plan the work that they do.
  • It is the number of teams that a Team Facilitator can support concurrently.
  • It is an adjustment to velocity, used in Spring Planning, to account for reduced availability of team members during the upcoming sprint.
  • It is the maximum number of stories that will be allowed in a sprint.

Photo:

photo4949588108425406778

Source:

https://scrumdictionary.com/term/capacity/

AWS Lamda

Please add these questions to the AWS lamda

#### Q30. What is AWS best practice for Lambda configuration?
- [ ] Overprovision memory to run your functions faster and reduce your costs. Do not overprovision your function timeout settings.
- [ ] Overprovision memory and your function timeout settings to run your functions faster and reduce your costs.
- [ ] Do not overprovision memory. Overprovision your function timeout settings to run your functions faster and reduce costs.
- [ ] Do not overprovision memory. Do not overprovision your function timeout settings to run your functions faster and reduce costs.


#### Q31. Basic Lambda permissions include permissions for what?
- [ ] removing log groups
- [ ] none of these answers
- [ ] creating log groups
- [ ] updating log groups


#### Q32. How are environment variables stored?
- [ ] DynamoDB tables
- [ ] key-value pairs
- [ ] S3 buckets
- [ ] none of these answers


#### Q33. You need to use a Lambda to provide backend logic to your website. Which service do you use to make your Lambda available to your website?
- [ ]  S3
- [ ]  API Gateway
- [ ] X-Ray
- [ ] DynamoDB


#### Q34. How can additional code or content be provided for your Lambda?
- [ ] aliases
- [ ]  blocks
- [ ] handlers
- [ ] layers


#### Q35. Lambdas allow for running of what other things?
- [ ] binaries
- [ ] executables
- [ ] all of these answers
- [ ] shell scripts


#### Q36. You need to use a Lambda to provide backend logic to your website. Which service do you use to make your Lambda available to your website?
- [ ] OX-Ray
- [ ] DynamoDB
- [ ] API Gateway
- [ ] S3


#### Q37. You are creating a Lambda to trigger on change to files in an 53 bucket. Where should you put the bucket name?
- [ ] in the Lambda function code
- [ ] in a Lambda environment variable
- [ ] in the Lambda tags
- [ ] in another S3 bucket


#### Q38. What action is needed before you can test a Lambda?
- [ ] Deploy the Lambda.
- [ ] Export the function
- [ ] none of these answers
- [ ] Configure a test event.


#### Q39. What kind of packages can you use with Node.js for Lambdas?
- [ ] Fleece
- [ ] NPM
- [ ] none of these answers
- [ ] Pod


#### Q40. How are environment variables stored?
- [ ] none of these answers
- [ ] Dynamo DB tables
- [ ] key-value pairs
- [ ] S3 buckets


#### Q41. Lambdas are monitored by default using which service?
- [ ] CloudTrail
- [ ] CloudWatch
- [ ] CloudFormation
- [ ] LogWatch


#### Q42. What can trigger a Lambda function execution?
- [ ] a table definition
- [ ] queue isolation
- [ ] STS Write
- [ ] an SNS topic

OOP duplicate detected and some new q

Q40 = Q46

there is variation of Q23 Two classes combine private data members and provide public member functions to access and manipulate those data member. Where is abstraction used?

What type of inheritance may lead to the diamond problem?
[ ] single level
[ ] multilevel
[ ] hierarchical
[+] multiple
Explanation: The diamond problem arises when multiple inheritance is used. This problem arises because the same name member functions get derived into a single class. Which in turn creates ambiguity in calling those methods.

Which statement about compositions and aggregations is true?
[ ] If one element of aggregation is dereferenced, all its elements are eligible for garbage collection.
[ ] If a composition dies, the contents die.
[ ] An aggregation contains only abstract classes.
[ ] The contents of a composition are all siblings.
offered answers are the same as for Q37 but question is diffrent
BTW
Q37. How are contents of a composition different from those of aggregation?

I had diffrend variant of one offered answer for Q3
Why would you create an abstract class, if it can have no real instances?
[ ] to explore a hypothetical class
[ ] to have common behavior in derived classes
[ ] to reserve memory for an unspecified class type
[ ] to prevent unwanted method implementation

and Q11
When is a constructor executed?
[ ] every time an object is referenced
[ ] when a class is defined using the class keyword
[ ] when an object is created from a class using the create keyword
[ ] when an object is created from a class

CSS Questions and Answers

The CSS Questions mentioned here do not match the ones asked in the test . Please update the question with answers as soon as possible .

New Skills

Power BI

A dataset that includes _ can be used to create a map visualization. (Select all that apply.)

A. house numbers, street names
B. geospatial data
C. city names, country names
D. longitude, latitude

[ ] A, B, C, D

[ ] A, C, D

[ ] B, C, D

[ ] D

How do you create a chart visual in Power Bl Desktop Report view? (Select all that apply.)

A. Click New Visual on the Home tab.

B. Select a chart visual in the Visualizations pane.

C. Click New Visual on the Data Tools tab.

D. Select a field that contains values.

[ ] A, B, or D
[ ] B or D
[ ] B orC
[ ] A or B

What daily sales number does this DAX measure formula calculate? CALCULATE(SUM([Sales]) ,DATESHTD([Date] ))

[ ] running total sales in each month that starts over each month

[ ] total sales for the entire month

[ ] running total in entire year for the entire month

[ ] rolling average over 12 months of sales

You are creating a report in Power Bl Desktop and want to restrict the data to records where Country="Canada". To accomplish this, what do you need to create?

[ ] a directive

[ ] a custom column

[ ] an indexed column

[ ] a parameter

What is the primary benefit of using visualizations such as line charts, bar charts, and column charts?

[ ] They are easier to create than other visualizations.
[ ] They require fewer resources than more complex visualizations.
[ ] They are also used in Excel, so they feel familiar to users.
[ ] They are free to use.

In Power Bl service, deleted pages are available after deletion until

[ ] midnight of the day on which they are deleted
[ ] the next billing cycle
[ ] you empty the Recycle Bin
[ ] the report has been saved

You need to add a required color to a bar chart. How can you add an exact color value to an existing bar chart?

[ ] Click the color in the visual (e.g., the bars) and right-click to select the color.
[ ] You cannot select custom colors in a bar chart or related visual.
[ ] Select the value closest to this color from the color formatting options.
[ ] Enter the hex value into the color formatting options.

The Excel function IF is nearly the same as which DAX function?

[ ] SWITCH
[ ] IF
[ ] IFX
[ ] IFS

Consider the Power Bl extract, transform, and load process (ETL). During this process, data is read and then

[ ] stored in SQL Server
[ ] written to an OLAP cube
[ ] assigned a data type
[ ] sorted by primary key

Power Bl's Publish to Web option allows you to embed visualizations within _. (Select all that apply.)

A. blog posts

B. email messages C. web sites

D. text messages

[ ] A,C

[ ] C

[ ] A, B, C

[ ] A, B, C, D

What can you do within the Power Bl Desktop Query Settings pane? (Select all that apply.)

A. Rename a query step.

B. Delete a query step.

C. Delete from one query step to the end.

D. Reorder the steps.

[ ] B, C, D

[ ] A, B, C, D

[ ] A, B, D

[ ] A, B, C

After you enter text in the Q&A box or O&A visual, Power Bl will _ your data to create a list of appropriate visualizations.

[ ] filter and group

[ ] sort and filter

[ ] sort, filter, and group

[ ] sort and group

CSS, Question 32 is wrong about precedence

Q32. Which type of declaration will take precedence?
  any declarations in user-agent stylesheets <<<<---Correct
  important declarations in user stylesheets
  normal declarations in author stylesheets
  important declarations in author stylesheets

That's wrong. In fact, declarations in user-agent stylesheets have the lowest precedence. Otherwise, no other CSS would have any effect.

"Important declarations in user stylesheets" have the highest precedence, per the CSS2 spec.

Add questions for Ruby on Rails

Noticed that there are no RoR questions here. Going to be taking that test and I'd be down to add some if that would be of interest.

Incorrect Java answer

Hi !
There is an error on the question 21 You have an ArrayList of names that you want to sort alphabetically. Which approach would NOT work?

The correct answer is names.sort(Comparator.comparing(String::toString))

Here is an exemple :

public static void main(String[] args) {
	List<String> list = new ArrayList<String>();
	list.add("cttention");
	list.add("attention");
	list.add("dttention");
	list.add("bttention");
	list.add("ettention");

	list.sort(Comparator.comparing(String::toString));
		
	System.out.println(list.toString());	
 }

And here is the output :

[attention, bttention, cttention, dttention, ettention]

Add label hacktoberfest

I am bringing this to your knowledge that contributes to this repository is not counting in the Hacktoberfest as there is no label of Hacktoberfest
PS: "hacktoberfest2020" is not an acceptable label under Hacktoberfest guidelines.

C++ quiz

Hi :)

Thank's for this repo it's great!
Some of the answers in C++ quiz are wrong.. here is the right answers:

Q3: The answer is --> a) 7 bits

Q4: The answer is --> a) Error
Because std::vector v1{1,2,3}; doesn't compile, It should be std::vector v1{1,2,3};

Q7: The answer is --> a) 4
You can see example here

Q9: The answer is --> c) Error
Same reason as Q4

Q10: The answer is --> c) The default access specifier for members of struct is public, where as for member of class , it is private.
You can see the answer here

Q11: The answer is --> a) typedef struct {
int sunday:1;
int monday:1;
// more days
int friday:1;
int saturday:1;
} weekdays;
That syntax says that each variable size is 1 bit.
'bit' is not a type in C++.

Thank's again !

Python: question 23

Correct answer should be my_game = Game() not the current my_game = (Game).

C# Question 26

C# question 26 syntax is wrong for all answers likely because of HTML escaping. System.Collections.Generic.List requires List where T is a Type name.

Answer would be:

var contacts = new List<string>();

image

New Questions for Object-Oriented Programming (OOP)

What best describes what object-oriented programming does?
[ ] It focuses on objects that interact cleanly with one another.
[ ] It programs exclusively to interfaces.
[ ] It programs exclusively to classes.
[ ] It creates one class for all business logic.

Can abstract classes be used in multilevel inheritance?
[ ] No, abstract classes can be used only in single-level inheritance since they must be immediately implemented.
[ ] yes, always
[ ] yes, but with only one abstract class
[ ] No, abstract classes do not have constructors.

Why is inheritance used when creating a new class?
[ ] to delegate coding responsibilities more efficiently
[ ] to conserve memory
[ ] to protect attributes from unwanted changes
[ ] to avoid writing duplicate code

How are the contents of a composition different from those of an aggregation?
[ ] The contents fo a composition are all siblings.
[ ] An aggregation contains only abstract classes.
[ ] If a composition dies, the contents die.
[ ] If one element of an aggregation is dereferenced, all its elements are eligible for garbage collection.

What is the relationship between abstraction and encapsulation?
[ ] Abstraction is about making relevant information visible, while encapsulation enables a programmer to implement the desired level of abstraction.
[ ] Abstraction and encapsulation are essentially the same.
[ ] Abstraction and encapsulation are unrelated.
[ ] Encapsulation is about making relevant information visible, while abstraction enables a programmer to implement the desired level of encapsulation.

HTML Assessment

Please correct question 11 choices in HTML Assessment from
Q11. What is NOT a valid attribute for the '<textarea>' element?

  • readonly => CORRECT
  • max
  • from
  • spellcheck

to this

  • readonly
  • max => CORRECT
  • form
  • spellcheck

Please correct question 14 choices in HTML Assessment from
Q14. When should you use

    and
      elements?
      '- Use
        when you want a bulleted list and
          when you want a numbered list.'
          '- Use
            when you have a list of items in which the order of the items matters. Use when you have a list of items that could go in any order.'
            '- Use
              when you want a bulleted list and
                when you want a numbered list.'
                '- Use
                  when you have a list of items in which the order of the items matters. <<<<CORRECT'

                  to this
                  '- Use
                    when you want a bulleted list and
                      when you want a numbered list.
                      '- Use
                        when you have a list of items in which the order of the items matters. Use
                          when you have a list of items that could go in any order.<<<<CORRECT'
                          '- Use
                            when you want a bulleted list and
                              when you want a numbered list.'
                              '- Use
                                when you have a list of items in which the order of the items matters. Use
                                  when you have a list of items that could go in any order.'

                  Please correct question 15 choices in HTML Assessment from
                  Q15. What is the difference between the post and get methods in a form?

                  • post is used for sending information to the server. get is used for retrieving form information from the server.
                  • get is used for sending information to the server. post is used for retrieving form information from the server.
                  • With get, data is included in the form body when send to the server. With post, the data goes through the URL <<<<<<CORRECT
                  • With post, data is included in the form body when send to the server. With get, the data goes through the URL

                  to this

                  • post is used for sending information to the server. get is used for retrieving form information from the server.
                  • get is used for sending information to the server. post is used for retrieving form information from the server.
                  • With get, data is included in the form body when send to the server. With post, the data goes through the URL
                  • With post, data is included in the form body when send to the server. With get, the data goes through the URL <<<<<<CORRECT

Python : Question 29

Q29. When does a for loop stop iterating?
when it encounters an infinite loop
when it encounters an if/else statement that contains a break keyword
when it has assessed each item in the iterable it is working on or a break keyword is encountered
when the runtime for the loop exceeds O(n^2)

Option 2 is marked as the right answer. Obviously it is wrong.

Taking the simple example
l = [1,2,3,4]
for i in l:
print(i)

It does not have if/else, however, it will stop iterating once all the elements in the iterable are finished.
There fore option 3 (when it has assessed each item in the iterable it is working on or a break keyword is encountered) is correct.

In React.js Assessment: Qustions 17 and 36 are the same

In React.js Assessment: Qustions 17 and 36 are the same ->
but they have different correct answer and I'm not sure which wone is the correct one?

  1. What do you call the message wrapped in curly braces below?
    let message = "Hi there";
    const element =

    {message}

    1. a JS function
    2. a JS element
      3 .a JS expression <<<<<--CORRECT
      4 . a JSX wrapper <<<<<--CORRECT
      is it 3 or 4?

Mistake at java answers

There is a mistake in question Q11 in the java answers. The answer is "123". The abs() method evaluates to the one inside mypackage.Math class.

Missing questions for Agile Methodologies

I was asked:

When the team needs to make a decision, what is the best course of action?
-Try to achieve concensus. //Answer?
-Take a vote and the majority rules.
-Identify the person who is most knowledgeable and ask them to decide.
-Let the most senior member of the team decide.

Which action is something the Team Facillitator should NOT do?
-Embrace servant leadership.
-Estimate story points. //Answer?
-Celebrate successes.
-Remove impediments

A team needs to do research, design, prototyping. What is this type of story called?
-Exploratory spike
-Backlog refinement
-Functional decomposition
-R&D

Which story about technical debt is true?
-Technical debt is another name for bugs
-It is at the Product Owner's descretion to allocate effort to reduce technical debt.
-Adding technical debt should be avoided at all costs. //Answer?
-Technical debt is what the Product Owner owes to the developers if they work a lot of overtime to complete the sprint.

Im not 100% sure about the answers I gave.

More questions for jQuery with some for-sure answers

Effects like show, hide, fadIn, and fadeOut can be called with no arguments, but can also take arguments for how long they should last. Which is NOT a duration argument supported by these functions?

  • "fast"
  • "extreme" <-- Correct
  • 2000
  • "slow"

Though jQuery offers visual effects, it is considered a best practice to use CSS to se up different states triggered by classes, where it makes sense. What's the easiest way to enable and disable a class bounce on an element with the ID dialog?

  • $('#dialog').classToggle('bounce')
  • $('#dialog.bounce').removeClass().addClass()
  • $(#dialog').addOrRemoveClass('bounce')
  • $(#dialog').toggleClass('bounce') <-- Correct

What is the main difference between selectors and filters?

  • Selectors are used to refine the content that filters have been applied to.
  • Selectors are used to find and select content in a page. Filters are used to refine the results of selectors. <-- Correct
  • Filters are used to remove content from the page. Selectors are used to add content to the page
  • There is no real difference. They are both used to build up lists of page content.

You want to create a custom right-click menu. How might you start the code?

  • $('#canvas').on('click.right', function(){ console.log('Handled a right-click') });
  • $('#canvas').on('contextual', function(){ console.log('Handled a right-click') });
  • $('#canvas').on('contextmenu', function(){ console.log('Handled a right-click') });
  • $('#canvas').on('rightclick', function(){ console.log('Handled a right-click') });

What is the correct way to check how many paragraphs exist on a page using jQuery?

  • $('p').count()
  • $('p').length <-- Correct
  • $('*').find('p')
  • $('p').length()

More questions for Machine learning

ML

Your company wants you to build an internal email text-prediction model to speed up the time that employees spend writing emails. What should you do?

[ ] Include training email data from seasoned employees.

[ ] Include training email data from employees who write the majority of internal emails.

[ ] Include training email data from all employees.

[ ] Include training email data from new employees.

What is this diagram a good example of?

[ ] a K-means cluster
[ ] K-nearest neighbor
[ ] a decision tree
[ ] a linear regression

You work for a large credit card processing company that wants to create targeted promotions for its customers. The data science team created a machine learning system that groups together customers who made similar purchases, and divides those customers based on customer loyalty. How would you describe this machine learning approach?

[ ] It uses unsupervised learning to cluster together transactions and unsupervised learning to classify the customers.

[ ] It uses only unsupervised machine learning.

[ ] It uses supervised learning to create clusters and unsupervised learning for classification.

[ ] It uses reinforcement learning to classify the customers.

You are using K-nearest neighbor and you have a K of 1. What are you likely to see when you train the model?

[ ] high variance and low bias
[ ] low bias and low variance
[ ] low variance and high bias
[ ] high bias and high variance

What is stacking?

[ ] You use different versions of machine learning algorithms.
[ ] The predictions of one model become the inputs to another.
[ ] You use several machine learning algorithms to boost your results. [ ] You stack your training set and testing set together.

Are data model bias and variance a challenge with unsupervised learning?

[ ] No, data model bias and variance are only a challenge with reinforcement learning.
[ ] Yes, data model bias is a challenge when the machine creates clusters.
[ ] Yes, data model variance trains the unsupervised machine learning algorithm.
[ ] No, data model bias and variance involve supervised learning.

You work for an ice cream shop and created the chart below, which shows the relationship between the outside temperature and ice cream sales. What is the best description of this chart?

[ ] It is a supervised trendline chart.
[ ] It is a clustering trend chart.
[ ] It is a linear regression chart.
[ ] It is a decision tree.

How is machine learning related to artificial intelligence?

[ ] Artificial intelligence is a form of unsupervised machine learning.
[ ] Artificial intelligence focuses on classification, while machine learning is about clustering data.
[ ] Machine learning is a type of artificial intelligence that relies on learning through data.
[ ] Machine learning and artificial intelligence are the same thing.

Which choice is best for binary classification?

[ ] K-means
[ ] logistic regression
[ ] linear regression
[ ] Principal Component Analysis (PCA)

Your organization allows people to create online professional profiles. A key feature is the ability to create clusters of people who are professionally connected to one another. What type of machine learning method is used to create these clusters?

[ ] reinforcement learning
[ ] supervised machine learning
[ ] unsupervised machine learning
[ ] binary classification

Your university wants to use machine learning algorithms to help sort through incoming student applications. An administrator asks if the admissions decisions might be biased against any particular group, such as women. What would be the best answer?

[ ] Machine learning algorithms are powerful enough to eliminate bias from the data.

[ ] Machine learning algorithms are based on math and statistics, and so by definition will be unbiased.

[ ] There is no way to identify bias in the data.

[ ] All human-created data is biased, and data scientists need to account for that.

With traditional programming, the programmer typically inputs commands. With machine learning, the programmer inputs

[ ] supervised learning
[ ] data
[ ] unsupervised learning
[ ] algorithms

Random forest is a modified and improved version of which earlier technique?

[ ] boosted trees
[ ] stacked trees
[ ] bagged trees
[ ] aggregated trees

Why is it important for machine learning algorithms to have access to high-quality data?

[ ] It will take too long for programmers to scrub poor data.
[ ] If the data is high quality, the algorithms will be easier to develop.
[ ] Low-quality data requires much more processing power than high-quality data.
[ ] If the data is low quality, you will get inaccurate results.

Which statement about K-means clustering is true?

[ ] In K-means clustering, the initial centroids are sometimes randomly selected.
[ ] K-means clustering is often used in supervised machine learning.
[ ] To be accurate, you want your centroids outside of the cluster.
[ ] The number of clusters are always randomly selected.

In K-nearest neighbor, the closer you are to neighbor, the more likely you are to

[ ] share common characteristics
[ ] be part of the root node
[ ] have a Euclidean connection
[ ] be part of the same cluster

Are data model bias and variance a challenge with unsupervised learning?

[ ] Yes, data model bias is a challenge when the machine creates clusters.
[ ] No, data model bias and variance are only a challenge with reinforcement learning.
[ ] No, data model bias and variance involve supervised learning.
[ ] Yes, data model variance trains the unsupervised machine learning algorithm.

In the HBO show Si'ffcon Valley, one of the characters creates a mobile application called Not Hot Dog. It works by having the user take a photograph of food with their mobile device. Then the app says whether the food is a hot dog. To create the app, the software developer uploaded hundreds of thousands of pictures of hot dogs. How would you describe this type of machine learning?

[ ] reinforcement machine learning
unsupervised machine learning
supervised machine learnin9
[ ] semi-supervised machine learning

You work for a large pharmaceutical company whose data science team wants to use unsupervised learning machine algorithms to help discover new drugs. What is an advantage to this approach?

[ ] You will be able to prioritize different classes of drugs, such as antibiotics.

[ ] You can create a training set of drugs you would like to discover.

[ ] The algorithms will cluster together drugs that have similar traits.

[ ] Human experts can create classes of drugs to help guide discovery.

In 2[ ]15, Google created a machine learning system that could beat a human in the game of Go. This extremely complex game is thought to have more gameplay possibilities than there are atoms of the universe. The first version of the system won by observing hundreds of thousands of hours of human gameplay; the second version learned how to play by getting rewards while playing against itself. How would you describe this transition to different machine learning approaches?

[ ] The system went from from supervised learning to reinforcement learning.

[ ] The system evolved from supervised learning to unsupervised learning.

The system evolved from unsupervised learnin9 to supervised learnin9.

[ ] The system evolved from reinforcement learning to unsupervised learning.

The security company you work for is thinking about adding machine learning algorithms to their computer network threat detection appliance. What is one advantage of using machine learning?

[ ] It could better protect against undiscovered threats.

[ ] It would very likely lower the hardware requirements.

[ ] It would substantially shorten your development time.

[ ] It would increase the speed of the appliance.

Your organization allows people to create online professional profiles. A key feature is the ability to create clusters of people who are professionally connected to one another. What type of machine learning method is used to create these clusters?

[ ] binary classification

[ ] reinforcement learning

[ ] supervised machine learning

[ ] unsupervised machine learning

You work for a music streaming service and want to use supervised machine learning to classify music into different genres. Your service has collected thousands of songs in each genre, and you used this as your training data. Now you pull out a small random subset of all the songs in your service. What is this subset called?

[ ] test data
[ ] supervised set
[ ] data cluster
[ ] big data

How do machine learning algorithms make more precise predictions?

[ ] Machine learning servers can host larger databases.
[ ] The algorithms can run on unstructured data.
[ ] The algorithms are better at seeing patterns in the data.
[ ] The algorithms are typically run on more powerful servers.

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