If n = 400 and p = 0.69, what is the 90% confidence interval for P?
Correct answer C. 0.652 and 0.728
Explanation
The standard error is √(0.69 × 0.31/400) ≈ 0.0231; multiplying by 1.645 gives 0.038, so the interval is 0.69 ± 0.038.
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