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    Calculating sample Size

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    A market research agency would like to estimate the proportion of Canadian households owning a personal computer. What minimum sample size will be required if they want to be 99% confident that the sample proportion will not differ from the true population proportion by more than 5%?

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    Solution Preview

    A market research agency would like to estimate the proportion of Canadian households owning a personal computer. What minimum sample size will be required if they want to be 99% confident that the sample proportion will not differ from the true population proportion by more than 5%?

    This is a two tailed test since we are testing whether sample proportion will not differ from the true population proportion

    σp=standard error of proportion=√(pq/n)
    The maximum value of standard error of proportion for any given value of n is when p=q=0.5

    confidence ...

    Solution Summary

    The sample size required for estimating proportion with 99% confidence is calculated

    $2.19

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