Data Principles week 8 part 2

Data Principles week 8 part 2

12th Grade

100 Qs

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Data Principles week 8 part 2

Data Principles week 8 part 2

Assessment

Passage

English

12th Grade

Practice Problem

Medium

Created by

Đức Trần

Used 2+ times

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100 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does the mean value of an attribute in a dataset represent?

The sum of all the values of the attribute

The expected value of the attribute

The difference between the highest and lowest value of the attribute

The product of all the values of the attribute

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How is the covariance between two attributes A and B defined?

Cov(A, B) = E((A - Ā)(B - B̄))

Cov(A, B) = E(A + B) - ĀB̄

Cov(A, B) = E(A/B) - Ā/B̄

Cov(A, B) = E(A - B) - Ā - B̄

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following is a simplified computation of covariance?

Cov(A, B) = E(A + B) - ĀB̄

Cov(A, B) = E(A · B) - ĀB̄

Cov(A, B) = E(A/B) - Ā/B̄

Cov(A, B) = E(A - B) - Ā - B̄

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a negative covariance between two variables A and B indicate?

A and B tend to move in the same direction

A and B are independent

A and B tend to move in opposite directions

The relationship between A and B cannot be determined

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What can be inferred if the covariance between two variables A and B is zero?

A and B tend to move in the same direction

A and B tend to move in opposite directions

A and B are independent

A non-linear relationship can exist that still would result in a covariance value of zero

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

When two variables A and B have a positive covariance, what is their relationship?

A and B are independent

A and B tend to move in opposite directions

A and B tend to move in the same direction

The relationship between A and B cannot be determined

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the expected value (E) of the stock prices for AllElectronics?

$4

$10.8

$7

$20

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