Question: The MINITAB output given in Table 9.27 resulted from fitting the multiple regression model relating ???? to the explanatory variables N, D, S, U, and

The MINITAB output given in Table 9.27 resulted from fitting the multiple regression model relating ???? to the explanatory variables N, D, S, U, and R. Assuming that the assumptions of the model are valid, use the information in Table 9.27 to answer the following questions.

(a) Do the VIF statistics suggest there are any possible collinearity problems?

Explain.

(b) Test ????0 ∶ ???????? = ???????? = ???????? = ???????? = ???????? = 0 at the ???? = 0.01 level.

(c) Estimate the expected change in ???? for a one unit increase in R when all of the other explanatory variables are held fixed.

(d) Test ????0 ∶ ???????? = 0 at the ???? = 0.05 level.

(e) Compute a 95% confidence interval for ????????.

(f) Which explanatory variable should be dropped from the model first?

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