In Problem 13.3 on page 469, you predicted the mean annual revenue for metropolitan areas in the United States, based on the mean age (Age) and mean BizAnalyzer score (Biz Analyzer) for a sample of 25 small business metropolitan areas. Use the following results:
a. Construct a 95% confidence interval estimate of the population slope between mean revenue and mean age.
b. At the 0.05 level of significance, determine whether each independent variable makes a significant contribution to the regression model. On the basis of these results, indicate the independent variables to include in this model.

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