Past studies show p ≈ 0.20. We want a 95% CI with margin of error ≤ 0.04.
What minimum n is required?
- A
240
- B
1068
- Ccheck_circle
385
- D
97
Explanation
n ≥ (1.96/0.04)² · 0.16 = 2401·0.16 = 384.16, round up to 385.
Constructing a Confidence Interval for a Population Proportion
AP Statistics· difficulty 3/5
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