If π = 0.90, a sample size of n = 10 is large enough for the sampling distribution to be well approximated by a normal distribution.

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For a sampling distribution of a proportion to be approximated by a normal distribution, the sample size needs to satisfy the conditions np ≥ 10 and n(1-p) ≥ 10. With π = 0.90 and n = 10, np = 9 and n(1-p) = 1, which do not meet these conditions.

If π = 090, a Sample Size of N = 10 Is Large