Treatment group: 30 successes in 100. Control group: 20 successes in 100. Test H₀: p₁ = p₂ vs Hₐ: p₁ > p₂.
What is the test statistic z?
- A
1.96
- B
1.00
- Ccheck_circle
1.63
- D
2.31
Explanation
z = (0.30 − 0.20)/0.0612 ≈ 1.63.
Tests for the Difference of Two Proportions
AP Statistics· difficulty 3/5
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