Question: A rivet is to be inserted into a hole. A random sample of n = 15 parts is selected, and the hole diameter is measured.

A rivet is to be inserted into a hole. A random sample of n = 15 parts is selected, and the hole diameter is measured. The sample standard deviation of the hole diameter measurements is s = 0.008 millimeters. Construct a 99% lower confidence bound for σ2.

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