Assume the diameters are normally distributed.
Diameters, in mm, were measured for eight specimens of a certain type of ball bearing. The results were
8.4 8.2 9.5 9.3 8.8 9.8 8.5 9.1
a. Find a 98% prediction interval for the diameter of a single ball bearing.
b. Find a tolerance interval for the diameter that contains 99% of the ball bearings with 95% confidence.
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