Correlation

Question 1

Complete the statement based on the information provided. The value of r is and is relatively close to , so the variables are associated. It appears that, as the age of an employee increases, the number of sick days taken .

Revolt · Accepted Answer

positive; Selection 1: positive; Selection 2: 1; Selection 3: closely; Selection 4: increases

Question 2

00.5✔ 1

Revolt · Accepted Answer

1

Question 3

looselynot✔ closely

Revolt · Accepted Answer

closely

Question 4

decreases ✔ increasesstays the same

Revolt · Accepted Answer

increases

Question 5

Select the statement which best describes the relationship between the price and sales.

Revolt · Accepted Answer

The value of r indicates that the number of sales decreases as the price increases.

Question 6

Select the most likely value of r for this data set.

Revolt · Accepted Answer

−0.78

Question 7

Select the most likely value of r for this data set.

Revolt · Accepted Answer

0.17

Question 8

If the temperature is converted to degrees Celsius and the electricity used to kilowatt-hours, how will the value of r be affected?

Revolt · Accepted Answer

It will stay the same because correlation is unitless.

Question 9

If age was on the vertical axis and miles per gallon on the horizontal axis, how would the correlation change? Select all statements that would apply to the new correlation coefficient.

Revolt · Accepted Answer

The sign would remain the same.; It would have the same value.

Question 10

Complete the statements based on the information provided. The scatterplot including only the blue data points shows association. Including the orange data point at (86, 0.4) would the correlation and the value of r.

Revolt · Accepted Answer

a strong positive; Selection 1: a strong positive; Selection 2: weaken; Selection 3: decrease

Correlation Answers

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