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    Confidence interval and sample size

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    A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 4 months of the true value with approximately 80% confidence, what should the sample size be?

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    Confidence Interval for the Mean
    A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard ...

    Solution Summary

    The solution provides step by step method for the calculation of Confidence interval and sample size. Formula for the calculation and Interpretations of the results are also included.

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