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Math Help - How large should my survey be?

  1. #1
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    How large should my survey be?

    I need to conduct a 10min long marketing survey with 6 to 7 questions . How large should my sample size be to have results representative of a 1000000-large population group, considering I want to achieve a 95% confidence level?


    I have read the formulas:
     n = ({z \sigma \over E })^2

    but how can I reconcile the concept of a questionnaire with the standard deviation of the sample population  \sigma and the error E? Is there even a mean or proportion to talk about? The only unambiguous part is z = 1.96 for 95% confidence.
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  2. #2
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    Quote Originally Posted by chopet View Post
    I need to conduct a 10min long marketing survey with 6 to 7 questions . How large should my sample size be to have results representative of a 1000000-large population group, considering I want to achieve a 95% confidence level?


    I have read the formulas:
     n = ({z \sigma \over E })^2

    but how can I reconcile the concept of a questionnaire with the standard deviation of the sample population  \sigma and the error E? Is there even a mean or proportion to talk about? The only unambiguous part is z = 1.96 for 95% confidence.
    Read this: Determining Sample Size
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