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    Confidence Intervals - Proportion

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    A manufacturer of golf equipment wishes to estimate the number of left-handed golfers.

    How large of a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 3%?

    A previous study indicates that the proportion of left-handed golfers is 11%. How large of a sample is needed in order to be 95% confident that the sample proportion will not differ from the true proportion by more than 3%?

    What is the best way of going about this problem?

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    A previous study indicates that the proportion of left-handed golfers is 11%. How large of a sample ...

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    This solution calculates the size of a sample with a given confidence interval.

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