Question: Given the printout in Exercise 16.15, determine the approximate a. 90% confidence interval for the mean rating on test 4 for units that have been

Given the printout in Exercise 16.15, determine the approximate
a. 90% confidence interval for the mean rating on test 4 for units that have been rated at 300, 500, and 400 on the first three tests.
b. 90% prediction interval for the rating a unit will get on test 4 if its ratings are 300, 500, and 400 on the first three tests.

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