Use the results from Problem 4 in Chapter 8, as well as the computer output given here, to answer the following questions about the data from that problem.
a. Conduct the overall regression F test for the model where Y is regressed on X1, X2, and X3. Use α = .05. Interpret your result.
b. Provide variables-added-in-order tests for the order X2, X1, and X3.

c. Provide variables-added-in-order tests for the order X3, X1 and X2.
d. List all orders that can be tested, using the computer results below and in Problem 4 of Chapter 8. List all orders that cannot be so computed.
e. Provide variables-added-last tests for X1, X2, and X3.
f. Provide the variables-added-last test for X4 = X2X3 given that X2 and X3 are already in the model. Does X4 significantly improve the prediction of Y given that X2 and X3 are already in the model?