As a general rule, the normal distribution is used to approximate the sampling distribution of the sample proportion only if the sample size n is greater than or equal to 30.

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The normal distribution is used to approximate the sampling distribution of the sample proportion if the sample size is large enough such that both np and n(1-p) are greater than or equal to 10, where n is the sample size and p is the population proportion.

As a General Rule, the Normal Distribution Is Used to Approximate