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Question: A replacement part for a machine must be produced with in close specifications in order for it to be acceptable to customers. Suppose the sample variance for 20 parts turns o u t to be s² = 0.03.

a. Construct a 95% confidence interval of the population variance.

b. Production specifications call for a variance in the lengths of the parts to be exactly 0.05. Comment on whether or not the specification is being violated.

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Category:- Statistics and Probability
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