13. The following data are for 13. first-year students at Ecalpon Tech:

Aptitude Score First-year GPA X 560 00 Y 2 65 SX 75 00 SY 35 r 50

(a) Calculate the raw-score intercept and slope; state the regression equation.

(b) Val and Mike score 485 and 710, respectively, on the aptitude test. Predict their first-year GPAs.

(c) Compute the standard error of estimate.

(d) Set up the 95% confidence limits around Val’s and Mike’s predicted GPAs.

(e) For students with aptitude scores the same as Val’s, what proportion would you expect to obtain a GPA better than the first-year mean?