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1. A researcher obtained a...

1. A researcher obtained a correlation of r = –0.72 between the amount of time spent watching television and grade point average for college students. This means that there is a general tendency for students who watch more television also to have higher grade point averages.

True

False

2. The point-biserial correlation is the correct correlation to use when both X and Y are dichotomous variables.

True

False

3. For the following data, SP equals _____.

X Y

2 4

1 2

3 5

2 5

-1

-11

3

None of the other 3 choices is correct.

4. The Pearson and the Spearman correlations are both computed for the same set of data. If the Pearson correlation is r = +1.00, then what can you conclude about the Spearman correlation?

It will be positive.

It will have a value of 1.00

It will be positive and have a value of 1.00

There is no predictable relationship between the Pearson and the Spearman correlations.

5. The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle. For these data, what is the most likely value for the Pearson correlation?

r near 0

r near –1.00

r near +1.00

6. The point defined by X = 2 and Y = 5 is located on the line defined by the equationY = 4X - 3.

True

False

7. For the regression equation Y = 3X – 2, if the mean for Y is MY = 10, what is the mean for X?

8

28

4

Impossible to determine.

8. If there is a negative correlation between X and Y then the regression equation, Y = bX + a will have _____.

b > 0

b 0

a < 0

9. A linear regression equation is computed for a sample of n = 18 pairs of X and Y scores. For the analysis of regression testing the significance of the equation what are the df values for the F-ratio?

df = 1, 16

df = 1, 17

df = 2, 15

df = 2, 16

10. The following X and Y scores produce a regression equation of Y = 4X – 3. What is the value of SSresidual?

X Y

1 2

2 3

3 10

3

6

15

107

True

False

2. The point-biserial correlation is the correct correlation to use when both X and Y are dichotomous variables.

True

False

3. For the following data, SP equals _____.

X Y

2 4

1 2

3 5

2 5

-1

-11

3

None of the other 3 choices is correct.

4. The Pearson and the Spearman correlations are both computed for the same set of data. If the Pearson correlation is r = +1.00, then what can you conclude about the Spearman correlation?

It will be positive.

It will have a value of 1.00

It will be positive and have a value of 1.00

There is no predictable relationship between the Pearson and the Spearman correlations.

5. The scatter plot for a set of X and Y values shows the data points clustered in a nearly perfect circle. For these data, what is the most likely value for the Pearson correlation?

r near 0

r near –1.00

r near +1.00

6. The point defined by X = 2 and Y = 5 is located on the line defined by the equationY = 4X - 3.

True

False

7. For the regression equation Y = 3X – 2, if the mean for Y is MY = 10, what is the mean for X?

8

28

4

Impossible to determine.

8. If there is a negative correlation between X and Y then the regression equation, Y = bX + a will have _____.

b > 0

b 0

a < 0

9. A linear regression equation is computed for a sample of n = 18 pairs of X and Y scores. For the analysis of regression testing the significance of the equation what are the df values for the F-ratio?

df = 1, 16

df = 1, 17

df = 2, 15

df = 2, 16

10. The following X and Y scores produce a regression equation of Y = 4X – 3. What is the value of SSresidual?

X Y

1 2

2 3

3 10

3

6

15

107

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