From the t-table, read the critical value t(0.025; 12) — the value on 12 degrees of freedom with 0.025 in the upper tail. Give it to three decimals.
From the t-table, read the critical value t(0.025; 12) — the value on 12 degrees of freedom with 0.025 in the upper tail. Give it to three decimals.
Answer
2.179
Cells - t at 0.025 with 12 df · ±0.001 Row df = 12, column 0.025: 2.179. This is the multiplier for a 95 % interval on 12 df (0.025 in each tail). R: `qt(0.975, 12)` = 2.178813.
IBS1 App. A12 (layout, CC BY 4.0); S21 W7 handout for the ∞-row rule (shape only); bracketing authored from first principles (OpenIntro Statistics 4e §7.1, CC BY-SA, for the idea)