PSY-3301 Chapter 7 MC Quiz (Set 4)

Question 1

5 out of 5 points

The regression constant for predicting Y given X is symbolized by _________.

Question 2

5 out of 5 points

When predicting Y given X, _________.

Question 3

5 out of 5 points

If the correlation between two sets of scores is 0 and one had to predict the value of Y for any given value of X, the best prediction of Y would be _________.

.

Question 4

5 out of 5 points

You go to a carnival and a sideshow performer wants to bet you $100 that he can guess your exact weight just from knowing your height. It turns out that there is the following relationship between height and weight.

Height (in)

60.0

62.0

63.0

66.5

73.5

84.0

Weight (lbs)

99

107

111

125

153

195

Should you accept the performers bet? Explain.

Question 5

5 out of 5 points

If r = 0.4582, sY = 3.4383, and sX = 5.2165, the value of bY = _________.

Question 6

5 out of 5 points

For the following points what would you predict to be the value of Y’ when X = 19? Assume a linear relationship.

X

6

12

30

40

Y

10

14

20

27

Question 7

5 out of 5 points

If bY is negative, higher values of X are associated with _________.

Question 8

5 out of 5 points

When predicting Y from two variables relative to using only one variable, _________.

Question 9

5 out of 5 points

The points (0,5) and (5,10) fall on the regression line for a perfect positive linear relationship. What is the regression equation for this relationship?

Question 10

5 out of 5 points

In the regression equation Y’ = X, the Y-intercept is _________.

Question 11

5 out of 5 points

The regression equation most often used in psychology minimizes _________.

Question 12

5 out of 5 points

The least-squares regression line minimizes _________.

Question 13

5 out of 5 points

A researcher collects data on the relationship between the amount of daily exercise an individual gets and the percent body fat of the individual. The following scores are recorded.

Individual

1

2

3

4

5

Exercise (min)

10

18

26

33

44

% Fat

30

25

18

17

14

The value for the standard error of estimate in predicting % fat from daily exercise is _________.

 

Question 14

5 out of 5 points

Which of the following statements is(are) false?

Question 15

5 out of 5 points

If sY = sX = 1 and the value of bY = 0.6, what will the value of r be?

Question 16

5 out of 5 points

If the regression equation for a set of data is Y’ = 2.650X + 11.250 then the value of Y’ for X = 33 is _________.

Question 17

5 out of 5 points

There is ________ between the sY½X and r.

Question 18

5 out of 5 points

A researcher collects data on the relationship between the amount of daily exercise an individual gets and the percent body fat of the individual. The following scores are recorded.

Individual

1

2

3

4

5

Exercise (min)

10

18

26

33

44

% Fat

30

25

18

17

14

Based on the above data, if an individual exercises 20 minutes daily, his predicted % body fat would be _________.

Question 19

5 out of 5 points

If the value for aY is negative, the relationship between X and Y is _________.

Question 20

5 out of 5 points

The primary reason we use a scatter plot in linear regression is _________.