Constructing a Confidence Interval for a Population Proportion

AP Statistics· difficulty 3/5

A researcher wants a 95% CI for a population proportion with margin of error at most 0.03. No prior estimate is available, so use p* = 0.5.

What minimum sample size is required?

Explanation

n \geq (1.96/0.03)² \cdot 0.25 = 1067.1, round up to 1068.

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