In problem 12.6 on page 446, the owner of a moving company
wanted to predict labor hours based on the number of cubic feet moved. The data
are stored in Moving.
a. Construct a 95% confidence interval estimate of the mean
labor hours for all moves of 500 cubic feet.
b. Construct a 95% prediction interval of the labor hours of
an individual move that has 500 cubic feet.
c. Why is the interval in (a) narrower than the interval in
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