Refer to Example 13.1. a. Use a variable selection procedure to determine a model for this study.

Question:

Refer to Example 13.1.
a. Use a variable selection procedure to determine a model for this study.
b. Do the model conditions appear to be valid for the model constructed in part (a)? Justify your answer.
c. Use your fitted model to predict the value of EHg for a lake having Alk = 80, pH = 6, Ca = 60, and Chlo = 40.