Confidence interval for the average overhaul

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Reference no: EM131278635

You are estimating the cost of engine overhauls. A sample of 99 repairs showed an average overhaul of 285 hours with a standard deviation of 60 hours. Calculate a 95% confidence interval for the average overhaul. (Carry intermediate calculations to three decimal places.)

a. 268.20 ≤ μ ≤ 301.80

b. 273.18 ≤ μ ≤ 296.82

c. 281.61 ≤ μ ≤ 288.39

d. 271.00 ≤ μ ≤ 299.00

Reference no: EM131278635

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