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a. A random sample of 25 was drawn from a normal distribution with a standard deviation of 5. The sample mean is 80. Determine the 95% confidence interval estimate of the population mean.

  • statistics - ,

    CI95 = mean + or - 1.96(sd/√n)

    sd = standard deviation
    n = sample size

    Substitute the values from your problem into the formula and calculate.

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