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    Sample size for mean and Proportion

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    A consumer agency has retained an independent testing firm to
    examine a television manufacturer's claim that its 25-inch console
    model consumes just 110 watts of electricity. Based on a preliminary study, the population standard deviation has been estimated as 11.2 watts for these sets. In undertaking a larger
    study, and using a simple random sample, how many sets
    must be tested for the firm to be 95% confident that its sample
    mean does not differ from the actual population mean by more
    than 3.0 watts?

    NOTE: Please use an Excel spreadsheet for response. Please do not just
    provide the answers but show in complete detail how you arrived at the
    answers, step-by-step, from the beginning to the end of the solution.

    (9.62)

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    Solution Preview

    Sample Size: Estimating the Population Mean/Proportion
    A consumer agency has retained an independent testing firm to examine a television manufacturer's claim that its 25-inch console model consumes just 110 watts of electricity. Based on a preliminary ...

    Solution Summary

    Step by step method for calculation of sample size for mean and population proportion.

    $2.49

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