Question: A data set has 66 observations and five predictor variables. Three models are being considered. One has all five predictors and the others are smaller.

A data set has 66 observations and five predictor variables. Three models are being considered. One has all five predictors and the others are smaller. Below is residual error SS for all three models. The total SS was 48. Compute Cp and R2 for all three models. Which model should be used based on this information?
Number of predictors Residualerror SS
3 ............................................. 12.2
4 ............................................ 10.1
5 ............................................ 10.0

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