Question: Consider the situation in Review Exercise 8.74. Suppose a considerable effort is conducted to tighten the variability in the system. Following the effort, a random

Consider the situation in Review Exercise 8.74.

Suppose a considerable effort is conducted to “tighten”

the variability in the system. Following the effort, a random sample of size 40 is taken from the new assembly line and the sample variance is s2 = 0.188 ounces2.

Do we have strong numerical evidence that σ2 has been reduced below 1.0? Consider the probability P(S2 ≤ 0.188 | σ2 = 1.0), and give your conclusion.

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