Question: For sample mean x = 150, sample size n = 36 and sample standard deviation s = 40 find 80% confidence interval for population mean.

  1. For sample mean x = 150, sample size n = 36 and sample standard deviation s = 40 find 80% confidence interval for population mean. Population standard deviation is not known, you should use formula on page 328 with t-value fromAppendix Table IV (use column t0.10).

    135.6 to 148.4

    154.2 to 175.8

    141.3 to 158.7

    162.3 to 187.5

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