For the Body Fat data set, with Weight as the response variable and Age (X1), Height

(X2), Neck (X3), Chest (X4), Abdomen (X5), Knee (X6), Ankle (X7), Biceps (X8), and Forearm (X9) as the explanatory variables, use the information in Table 9.39 to answer the following questions assuming the full model has no problems.

(a) Apply the maximum ????2???????????? variable selection procedure and determine the best fitting model with fewest variables, that is within 2% of the maximum value of????2????????????.

(b) Based on the model in part (a), does it appear that age (X1) is an important variable for predicting Weight? Explain.

(c) Apply the BIC variable selection procedure to determine the best fitting model.

(d) Based on the best model according to the BIC variable selection procedure, does it appear that biceps circumference (X8) is an important variable for predicting Weight? Explain.