Power Computing Wants to Use Simple Random Sampling to Estimate

question 81

Multiple Choice

Power Computing wants to use simple random sampling to estimate the average repair time for the Apple iPods that are refurbished by the company.To build a 99% confidence interval estimate that is no wider than plus or minus 5 minutes, how many repair times would you have to include in the sample? Assume a pilot sample gives an estimate of 63 minutes for the population standard deviation.

• A)1121
• B)1057
• C)1231
• D)1168
• E)1348

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