Question 1

1pts

Suppose you will perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level .

n = 6, = 0.05

Group of answer choices

r = 0.878

r = 0.811

r = 0.811

r = 0.917

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Question 2

1pts

Suppose you will perform a test to determine whether there is sufficient evidence to support a claim of a linear correlation between two variables. Find the critical values of r given the number of pairs of data n and the significance level .

n = 19, = 0.01

Group of answer choices

r = 0.59

r = 0.456

r = 0.575

r = 0.575

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Question 3

1pts

Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.

r =0.71, n = 25

Group of answer choices

Critical values: r = 0.396, no significant linear correlation

Critical values: r = 0.487, no significant linear correlation

Critical values: r = 0.487, significant linear correlation

Critical values: r = 0.396, significant linear correlation

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Question 4

1pts

Given the linear correlation coefficient r and the sample size n, determine the critical values of r and use your finding to state whether or not the given r represents a significant linear correlation. Use a significance level of 0.05.

r =-0.466, n = 15

Group of answer choices

Critical values: r = 0.514, no significant linear correlation

Critical values: r = 0.514, no significant linear correlation

Critical values: r = 0.532, no significant linear correlation

Critical values: r = 0.514, significant linear correlation

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Question 5

1pts

Find the value of the linear correlation coefficient r.

The paired data below consist of the test scores of 6 randomly selected students and the number of hours they studied for the test.

Group of answer choices

-0.678

-0.224

0.678

0.224

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Question 6

1pts

Find the value of the linear correlation coefficient r.

The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands):

Group of answer choices

0.246

0.708

-0.071

0.235

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Question 7

1pts

Find the value of the linear correlation coefficient r.

The paired data below consist of the temperatures on randomly chosen days and the amount a certain kind of plant grew (in millimeters):

Group of answer choices

0

-0.210

0.256

0.196

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Question 8

1pts

Find the value of the linear correlation coefficient r.

A study was conducted to compare the average time spent in the lab each week versus course grade for computer programming students. The results are recorded in the table below.

Number of hours spent in labGrade (percent)109611511662958789158116461051

Group of answer choices

0.462

0.017

-0.335

-0.284

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Question 9

1pts

Find the value of the linear correlation coefficient r.

Two different tests are designed to measure employee productivity and dexterity. Several employees are randomly selected and tested with these results.

Group of answer choices

-0.280

0.986

0.115

0.471

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Question 10

1pts

Find the value of the linear correlation coefficient r.

Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below.

Group of answer choices

0.548

0.714

0.109

0.867