A replacem ent part fo r a m achine m ust be produced w ith in close

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A replacem ent part fo r a m achine m ust be produced w ith in close specifications in order fo r it to be acceptable to customers. Suppose the sample variance fo r 20 parts turns o u t to b e s2 = 0.03.

a. C onstruct a 95% confidence interval o f the population variance.

b. Production specifications call for a variance in the lengths o f the parts to be exactly 0.05. C om m ent on w hether or not the specification is being violated. P-399

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