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    computed the sample mean to be 100.

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    A) A statistics practitioner took a random sample of 50 observations from a population whose standard deviation is 25 and computed the sample mean to be 100. Estimate the population mean with 90% confidence.

    b) Repeat part a using a 95% confidence level

    c) Repeat part a using a 99% confidence level

    d) Describe the effect on the confidence interval estimate of increasing the confidence level.

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    Solution Preview

    Please see attached file.

    Confidence interval - mean

    90% confidence level
    100 mean
    25 std. dev.
    50 n
    1.677 t (df = 49)
    5.928 half-width
    105.928 upper ...

    Solution Summary

    This solution calculates the population mean with 90%, 95% and 99% confidence level and explains the effect of increasing the confidence level percentage.