Cedar & Stone: n = 12 returns, x̄ = 88.4 minutes, sample SD s = 6.3 (σ unknown). Fill the worksheet with the 95 % interval for μ, using t(0.025; 11) = 2.201. Tolerance ±0.05 each.
Cedar & Stone: n = 12 returns, x̄ = 88.4 minutes, sample SD s = 6.3 (σ unknown). Fill the worksheet with the 95 % interval for μ, using t(0.025; 11) = 2.201. Tolerance ±0.05 each.
Answer
Lower limit, 95 % (n = 12) → 84.4 · Upper limit, 95 % (n = 12) → 92.4
Cells - Lower limit, 95 % (n = 12) · ±0.05 - Upper limit, 95 % (n = 12) · ±0.05 σ unknown, df = 11 ≤ 30 → t = 2.201. SE = 6.3/√12 = 1.8187. Margin = 2.201 × 1.8187 = 4.003. Interval = 88.4 ± 4.003 = (84.40, 92.40) minutes.
H-W7 (the three cases) — shape only; Module 9 consolidation; original dataset