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1. A random sample of size 49 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the sample mean

  • statistics -

    95% interval = mean ± 1.96 SEm

    SEm = SD/√(n-1), but you can just use n

    I hope this helps.

  • statistics -

    45.35 to 48.65

  • statistics -

    (z test interval) =45.35 to 48.65

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