To use the normal approximation to determine a confidence interval to estimate a population proportion,np and n(1-p)must both be greater than or equal to 5.

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This is a requirement for the normal approximation to be valid. If np and n(1-p) are less than 5, then the normal approximation will not be accurate and alternative methods, such as the binomial distribution, should be used.

To Use the Normal Approximation to Determine a Confidence Interval