Question: Use the sample data from Problem 15.2 to answer the following questions: a. Construct a 90% confidence interval for the dependent variable when x1 =

Use the sample data from Problem 15.2 to answer the following questions:

a. Construct a 90% confidence interval for the dependent variable when x1 = 30 and x2 = 20.

b. Interpret the meaning of the interval constructed in part a.

c. Construct a 90% prediction interval for the dependent variable when x1 = 30 and x2 = 20.

d. Interpret the meaning of the interval constructed in part c.

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