Use the computer output for the Business Week magazine data of Problem 13 in Chapter 8, as well as the additional output here, to answer the following questions.
a. Perform the overall F test for the regression of Y on both independent variables, X2 and X1. Interpret your result.
b. Perform variables-added-in-order tests for both independent variables, with X2 added first.
c. Perform variables-added-in-order tests for both independent variables, with X3 added first.
d. Provide a table of variables-added-last tests.
e. Which predictors appear to be necessary? Why?

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Y Regressed on X2 and X3 Source DF x2 X3 Mean SquareFv 76498949 24.81773186 9.63 Type I SS Value Pr>F 1.76498949 1.40 0.2537 124.81773186 SourceDF X2 X3 Type II SS Mean Square F Value Pr> F 797795163 24.81773186 797795163 24.81773186 6.31 0.0224 19.63 0 0004