Optional Homework Exercises, Set #3, for C++ and Bock's Chapter 4:

1. Add the computation of the predicted values (yhat) to the C++ for 
PolyRegression, and show the results in the output window whent the program 
runs. Label them.

2. Add the computation of the residuals to the C++ for PolyRegression, and show 
the results in the output window whent the program runs. Label them.

3. Add the computation of the standard errors for the betas to the C++ for 
PolyRegression, and show the results in the output window whent the program 
runs. Label them.

4. Add the computation of the error variance-covariance matrix for the betas to 
the C++ for PolyRegression, and show the results in the output window whent the 
program runs. Label them.

5. Change the input to the program so that the user enters the variable names 
for the X and Y variables for the regression, and the variable name for the 
column of weights (that is, the Ns, D), instead of column numbers.