We are evaluating the sheet metal scrap rate in a contractor

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We are evaluating the sheet metal scrap rate in a contractor proposal. Based on a sample of 28 parts you calculate a mean rate of 6.50% (treat as 6.50) and a standard deviation of 1.20. Calculate a 80% confidence interval to be used to support negotiations.

Possible Answers:
6.08 ≤ μ ≤ 6.92
6.18 ≤ μ ≤ 6.82
6.20 ≤ μ ≤ 6.80
6.43 ≤ μ ≤ 6.57

Reference no: EM13803742

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