a.
To Find: The 90% confidence interval for the mean useful life of a Brand A and Brand B when the cutting speed is 45 meters per minute.
To Compare: The width of the two intervals.
To Comment: The reason for any difference between the intervals.
b.
To Find: The 90% prediction interval for the mean useful life of a Brand A and Brand B when the cutting speed is 45 meters per minute.
To Compare: The width of the two confidence intervals with the two prediction intervals.
To Comment: The reason for any difference between the intervals.
c.
To Find: The 95% prediction interval for the mean useful life of a Brand A when the cutting speed is 100 meters per minute.
To Explain: What additional assumption to make in order to ensure the validity of an extrapolation.
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Statistics (13th Edition)
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