PSY-3301 Chapter 7 MC Quiz

Question 1

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 2

0 out of 5 points

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

Question 3

0 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

If = 57.2, = 84.6, and bY = 0.37, the value of aY = _________.

Question 5

5 out of 5 points

If = 0.0 the relationship between the variables is _________.

Question 6

5 out of 5 points

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

Question 7

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 8

5 out of 5 points

If the value of = 4.00 for relationship A and = 5.25 for relationship B, in which relationship would you have the most confidence in a particular prediction?

Question 9

5 out of 5 points

When using more than one predictor variable, _________ tells us the proportion of variance accounted for by the predictor variables.

Question 10

5 out of 5 points

When the relation between X and Y is imperfect, the prediction of Y given X is _________.

Question 11

5 out of 5 points

The symbol for the standard error of estimate when predicting Y given X is _________.

Question 12

5 out of 5 points

Which of the following statements is(are) false?

Question 13

5 out of 5 points

For regression purposes,

Question 14

5 out of 5 points

If bY = 0, the regression line is _________.

Question 15

0 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

If an individual has 22% fat, his predicted amount of daily exercise is _________.

Question 16

0 out of 5 points

There is ________ between the sY½X and r.

Question 17

5 out of 5 points

If X and Y are transformed into z scores, and the slope of the regression line of the z scores is -0.80, what is the value of the correlation coefficient?

Question 18

0 out of 5 points

In a particular relationship N = 80. How many points would you expect on the average to find within ±1 of the regression line?

Question 19

5 out of 5 points

S (Y – Y’)2 represents _________.

Question 20

5 out of 5 points

What would you predict for the value of Y for the point where the value of X is ?