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(See Steps) (a) In a recent sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct the 99% confidence interval

Question: (a) In a recent sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36. Construct the 99% confidence interval for the population mean m repair cost for all computers. Decide whether the normal distribution or the t-distribution should be used, and assume repair costs are normally distributed.

  1. Refer to problem #1a. Find the 90% confidence interval for the population mean repair cost m of all computers. Which confidence interval is wider, and why?
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    Solution: The downloadable solution consists of 1 pages
    Deliverable: Word Document


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