For the data in Exercise 1, use the S-PLUS function reglev to comment on the advisability of using M regression with Schweppe weights For the data used in Exercise 7, compute the .95 confidence...

For the data in Exercise 1, use the S-PLUS function reglev to comment on the advisability of using M regression with Schweppe weights

For the data used in Exercise 7, compute the .95 confidence intervals for the parameters using OLS as well as M regression with Schweppe weights

Referring to Exercise 6, how do the results compare to the results obtained with the S-PLUS function reglev?