Quiz about Correlation and R Value Review

Question 1

It is determined that the regression equation between two variables is given as: $$y=20000-0.153x$$ . It is also determined that $$r^2=0.57$$ . Which of the following is the value for the correlation coefficient?

Accepted Answer

-0.755

Answer

-0.325

Answer

0.325

Answer

0.755

Question 2

If there is a very strong positive correlation between two variables, a causal relationship exists between the two variables.

Accepted Answer

False

Answer

True

Question 3

Given the following Scatter Plot, select the option that is most likely the r value.

Accepted Answer

$$r=.934$$

Answer

$$r=.27$$

Answer

$$r=-.862$$

Answer

$$r=.54$$

Question 4

Given the following Scatter Plot, select the option that is most likely the r value.

Accepted Answer

$$r=-.981$$

Answer

$$r=-.45$$

Answer

$$r=.728$$

Answer

$$r=.12$$

Question 5

Find the line of best fit

Accepted Answer

y = 0.27x + 5.8

Answer

y = 5.8x + 0.27

Answer

y = 6

Answer

y = 0

Question 6

Which scatter plot shows no relationship?

Accepted Answer

Graph D

Answer

Graph A

Answer

Graph B

Answer

Graph C

Question 7

What is the correlation for the following Scatter Plot.

Accepted Answer

Strong Negative

Answer

Weak Positive

Answer

No Correlation

Answer

Weak Negative

Answer

Strong Positive

Question 8

What is the correlation for the following Scatter Plot.

Accepted Answer

Strong Positive

Answer

Weak Positive

Answer

No Correlation

Answer

Strong Negative

Answer

Weak Negative

Question 9

Given the following Scatter Plot, select the option that is most likely the r value.

Accepted Answer

$$r=-.1$$

Answer

$$r=-.981$$

Answer

$$r=.92$$

Answer

$$r=.765$$

Question 10

r = -0.3 is considered to have...

Accepted Answer

weak negative correlation

Answer

moderate negative correlation

Answer

no correlation

Answer

strong negative correlation

Question 11

Which of the following points has the greatest influence on the strength of the correlation coefficient?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Answer

E

Question 12

In the scatterplot of y versus x shown above, the least squares regression line is superimposed on the plot. Which of the following points has the largest residual?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Answer

E

Question 13

Question 13.

Accepted Answer

98.0%

Answer

82.4%

Answer

90.5%

Answer

95.1%

Answer

95.3%

Question 14

Question 14.

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Answer

E

Question 15

Which of the graphs would have a correlation coefficient of r = 0.69 ?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 16

when ice cream sales increase, incidents of sunburn increase

Accepted Answer

Correlation

Answer

Causation

Question 17

Estimate the correlation coefficient.

Accepted Answer

r = 0.8

Answer

r = -0.8

Answer

r = -0.5

Answer

r = 0.5

Question 18

You are analyzing a scatter plot that has a negative correlation. What is true of the of the x and y values?

Accepted Answer

As x increases, y decreases

Answer

As x increases, y increases

Answer

As x decreases, y decreases

Correlation and R Value Review

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