# If bY = 0, the regression line is

Question 1

5 out of 5 points

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If bY = 0, the regression line is _________.

Question 2

5 out of 5 points

When predicting Y given X, _________.

Question 3

5 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 4

5 out of 5 points

The least-squares regression line minimizes _________.

Question 5

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 6

5 out of 5 points

S (Y – Y’) equals _________.

Question 7

0 out of 5 points

If the relationship between X and Y is perfect:

Question 8

5 out of 5 points

The assumption of homoscedasticity is that _________.

Question 9

5 out of 5 points

The regression coefficient for predicting Y given X is symbolized by _______

Question 10

5 out of 5 points

The regression of Y on X _________.

Question 11

5 out of 5 points

There is ________ between the sY½X and r.

Question 12

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 13

5 out of 5 points

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

Question 14

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 15

5 out of 5 points

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

Question 16

5 out of 5 points

S (Y – Y’)2 represents _________.

Question 17

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 18

5 out of 5 points

If N = 8, S X = 160, S X2 = 4656, S Y = 79, S Y2 = 1309, and S XY = 2430, what is the value of bY?

Question 19

5 out of 5 points

If = 0.0 the relationship between the variables is _________.

Question 20

5 out of 5 points

For regression purposes,