Question: (b) For the quadratic regression compute prediction intervals for forecasts of consumption for various prices, for exam- ple, P = 20, 40, 60, 80, 100,

(b) For the quadratic regression compute prediction intervals for forecasts of consumption for various prices, for exam-

ple, P = 20, 40, 60, 80, 100, and 120 cents per 1,000 cubic feet [using (6.13)].

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