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Bank Survey - sample size

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Bea asks Brian the sample size and the timeframe.
Brian responds, 140,000

Suppose the bank has one million customers in the USA (where the survey is conducted)
With a 95% confidence level and a margin of error of 3%, what would you recommend the minimum sample size to be?
This is the minimum sample size. In practice, there would be some adjusted increase for an estimated response rate.

n = p(1-p)(Z/E)^2 =

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This solution shows details of how to calculate the appropriate sample size from the information provided.

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