p̂₁ = 0.50 (n₁=200), p̂₂ = 0.40 (n₂=200). 90% CI for p₁ − p₂.
What is the 90% CI?
- Acheck_circle
(0.019, 0.181)
- B
(0.049, 0.151)
- C
(0.000, 0.200)
- D
(0.004, 0.196)
Explanation
0.10 ± 1.645·0.0492 = 0.10 ± 0.0809 ≈ (0.019, 0.181).
Confidence Intervals for the Difference of Two Proportions
AP Statistics· difficulty 3/5
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