1. (Requires StatTools) Run a regression of Y versus the X's, using dummy variables as necessary. Which of the following is true?

Click here to reference the data needed to answer the question.

a. For any given values of X1 and X2, if X3 changes from No to Yes, Y is expected to increase by about 22.39 units.

b. If X1 and X2 both increase by 5 units, Y is expected to increase by about 6.03 units, but this depends on the category in X3 (Yes, No, or Maybe).

c. For any given values of X1 and X2, if X3 changes from Maybe to No, Y is expected to decrease by about 13.33 units.

d. None of these choices are true.

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2. (Requires StatTools) Run a regression of Y versus X1, X3, and the interaction between X1 and X3, using dummy variables as necessary. Which of the following is true?

Click here to reference the data needed to answer the question.

a. If X1 decreases by 10 units and X3 is Maybe, Y is expected to decrease by about 58.88.

b. If X1 decreases by 10 units and X3 is Yes, Y is expected to decrease by about 38.90.

c. If X1 decreases by 10 units and X3 is No, Y is expected to decrease by about 61.55.

d. All of these choices are true.

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