solution

 

The following partial MINITAB regression output for the starting salary data relates to predicting the starting salary of a marketing graduate having a grade point average of 3.25.

 

a Report (as shown on the computer output) a point estimate of and a 95 percent confidence interval for the mean starting salary of all marketing graduates having a grade point average of 3.25.

b Report (as shown on the computer output) a point prediction of and a 95 percent prediction interval for the starting salary of an individual marketing graduate having a grade point average of 3.25.

 c Remembering that s .536321 and that the distance value equals ( 兾s) 2 , use from the computer output to hand calculate the distance value when .

d Remembering that for the starting salary data and hand calculate (within rounding) the confidence interval of part (a) and the prediction interval of part (b).