March 26, 2017

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Determine the sample size necessary to estimate a population proportion to within .03 with 90% confidence assuming you have no knowledge of the approximate value of the sample proportion.

  • Statistics - ,

    Try this formula:
    n = [(z-value)^2 * p * q]/E^2

    Note: n = sample size needed; .5 for p and .5 for q are used if no value is stated in the problem. E = maximum error, which is .03 in the problem. Z-value is found using a z-table to represent 90% interval. Round final result to next highest whole number.
    Also: ^2 means squared and * means to multiply.

    I hope this will help get you started.

  • Statistics - ,

    n = [(z-value)^2 * p * q]/E^2

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