Computer Depot is a large store that sells and repairs computers. A random sample of 110 computer repair jobs took technicians an average of 93.2 minutes per computer. Assume that o is known to be 16.9 minutes. Find a 99% confidence interval for the population mean u for the computer repairs. Interpret the interval in the context of this problem. State what assumptions were met to use the method you selected.

asked by Jasmine
  1. For raw score, use SD, but for means, use Standard Error of the mean (SEm).

    99% = mean ± 2.585 SEm

    SEm = SD/√n

    posted by PsyDAG

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