123 Suppose there are six independent variables x1, x2, x3, x4, x5, and x6 that might be useful in predicting a response y . A total of n = 50 observations is available, and it is decided to employ stepwise regression to help in selecting the independent variables that appear to be useful. The computer fits all possible one-variable models of the form

where xi is the i th independent variable, i = 1, 2,c, 6.
The information in the following table is provided from the computer printout:

a. Which independent variable is declared the best onevariable predictor of y ? Explain.

b. Would this variable be included in the model at this stage? Explain.

c. Describe the next phase that a stepwise procedure would execute.

Transcribed Image Text:

E(y) = Bo + Bxi