Answer
Prediction in part (a) was made to find the confidence interval for the mean well-being index composite score of all individuals whose commute time is 20 minutes.
Prediction in part (c) was made to predict the interval of the well-being index composite score for one individual (Jane) whose commute time is 20 minutes. The interval obtained is the same for any individual whose commute time is 20 minutes.
Work Step by Step
Given above.
