Sample Size Required for a Survey of Shoppers

A survey of shoppers is planned to determine what percentage use credit cards. Prior surveys suggest that 59% use credit cards. The required margin of error is 0.02 at 95% confidence. What is the minimum sample size required to assure that your sample proportion "p" will be within the required margin of error around the population proportion "p."

Use the traditional methods for testing hypotheses and show the results of all steps in the process.

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...9 (given)
L= 0.02 ( given)

Doing the math:
Sample Size = 13390.16

95% Confidence Interval = (p - z* ...