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    Confidence interval for proportions

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    In a city of 50,000, you conducted 1,000 interviews on a random sample basis to find out how many respondents wore sneakers. Of the 1,000 interviewed, 300 wore sneakers. With a 95% confidence, how precise is your estimate?

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    Solution Preview

    We are being asked to find the confidence interval of our estimate

    proportion who wore sneakers = 0.3 or 30% =300/1000

    95% Confidence limits for proportions=
    p= 30%
    q=1-p= 70%
    n=sample size= 1000
    sp=standard ...

    Solution Summary

    The expert calculates confidence interval for proportions.