# Chapter 1. Confidence Interval for the Regression Slope

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### Question 1.1

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Correct. Using statistical software is the best way to find the value of “b” and the value of “SEb."
Incorrect. Using statistical software is the best way to find the value of “b” and the value of “SEb."
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2:10

### Question 1.2

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Correct. This is a correct statement. Both estimating slope and testing slope are inference on slope.
Incorrect. This is a correct statement. Both estimating slope and testing slope are inference on slope.
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2:20

### Question 1.3

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Correct. The roles of X and Y are incorrectly interchanged. Slope tells us the average change in Y for a one unit increase in X.
Incorrect. The roles of X and Y are incorrectly interchanged. Slope tells us the average change in Y for a one unit increase in X.
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3:16

### Question 1.4

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Correct. This is a correct statement.
Incorrect. This is a correct statement.
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3:50

### Question 1.5

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Correct. Both have degrees of freedom = n – 2.
Incorrect. Both have degrees of freedom = n – 2.
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5:12

### Question 1.6

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Correct. Slope tells us the average change in Y for every one unit increase in X. For this example, X is diameter measured in inches and Y is volume of tree measured in hundred board feet. Since slope = 5.07 is positive, the change in Y is an “increase." Thus, slope tells us that for every one inch increase in tree diameter, the average increase in volume is 5.07 hundred board feet.
Incorrect. Slope tells us the average change in Y for every one unit increase in X. For this example, X is diameter measured in inches and Y is volume of tree measured in hundred board feet. Since slope = 5.07 is positive, the change in Y is an “increase." Thus, slope tells us that for every one inch increase in tree diameter, the average increase in volume is 5.07 hundred board feet.
2
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