Two batteries: μ_A = 10 hr, σ_A = 1 hr, n_A = 16; μ_B = 9 hr, σ_B = 1 hr, n_B = 16.
What is σ_(x̄_A − x̄_B)?
- A
≈ 1.0
- Bcheck_circle
≈ 0.354
- C
≈ 0.25
- D
≈ 0.5
Explanation
SD = √(1/16 + 1/16) = √(0.125) ≈ 0.354.
Sampling Distributions for Differences in Sample Means
AP Statistics· difficulty 3/5
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