In Example 4.9, the restricted version of the model can be estimated using all 1,388 observations in

Question:

In Example 4.9, the restricted version of the model can be estimated using all 1,388 observations in the sample. Compute the R-squared from the regression of bwght on cigs, parity, and famine using all observations. Compare this to the fl-squared reported for the restricted model in Example 4.9.