You are considering four independent variables for inclusion in a regression model. You select a sample of 30 observations, with the follwings results:
1. The model that includes independent variables A and B has a Cp value equal to 4.6.
2. The model that includes independent variables A and C has a Cp value equal to 2.4.
3. The model that includes independent variables A, B, and C has a Cp value equal to 2.7.
a. Which models meet the criterion for further consideration?
b, How would you compare the model that contains independent variables A,B, and C to the model that contains independent variables A and B?