Using the Heights data, create a construction set by selecting approximately 2/3 of the rows of the data file at random. The remaining 1/3 of the rows will comprise the validation set. Obtain...

Using the Heights data, create a construction set by selecting approximately 2/3 of the rows of the data file at random. The remaining 1/3 of the rows will comprise the validation set.

Obtain predictions from the model fit to the construction set for the values of Mheight in the validation set. Compute and report the average squared residual. The square root of this quantity is an estimate of the average prediction error.