The large sample confidence interval formula for estimating π can always safely be used if n ≥ 30.

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Quizplus · Accepted Answer

The large sample confidence interval formula for estimating a population proportion π assumes not only that the sample size n is large (often n ≥ 30 is used as a rule of thumb) but also that the sample proportion is not too close to 0 or 1, specifically that both np and n(1-p) are greater than or equal to 10.

The Large Sample Confidence Interval Formula for Estimating π Can