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Stat Tutor

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0:55

Correct. Using statistical software is the best way to find the value of “b” and the value of “SE_{b}."

Incorrect. Using statistical software is the best way to find the value of “b” and the value of “SE_{b}."

2

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2:10

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.

2

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2:20

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.

2

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3:16

Correct. This is a correct statement.

Incorrect. This is a correct statement.

2

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3:50

Correct. Both have degrees of freedom = n – 2.

Incorrect. Both have degrees of freedom = n – 2.

2

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5:12

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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