(Solution) - Use the computer results from Problem 9 of Chapter 8 -(2025 Original AI-Free Solution)

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Use the computer results from Problem 9 of Chapter 8 to answer the following questions.
a. Test H0: pYX1 = 0 and H0: pYX2 = 0.
b. Test H0: pYX1|X2 = 0 and H0: pYX2|X1 = 0.
c. Based on your results in parts (a) and (b), which variables (if any) should be included in the regression model, and what is their order of importance?