statistics

John Davis, a manager of a supermarket, wants to estimate the proportion of customers that will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 3% with 98% confidence?

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asked by Mark
  1. Formula:
    n = [(z-value)(p)(q)]/E^2

    z-value = 2.33 for 98% confidence
    p = .5 if no value is stated
    q = 1 - p
    E = Maximum error

    With your data:

    n = [(2.33)(.5)(.5)]/.03^2

    I'll let you take it from here. Round to the next whole number.

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    posted by MathGuru
  2. 647.22

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    posted by Ashley

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