Two chains supply 12 and 10 baskets. State the df for the Welch t by hand, the df for the pooled t, and — for a separate study of 12 stores measured before and after — the df for the paired t. Tolerance 0 each.
Two chains supply 12 and 10 baskets. State the df for the Welch t by hand, the df for the pooled t, and — for a separate study of 12 stores measured before and after — the df for the paired t. Tolerance 0 each.
Answer
Welch df by hand → 9 · Pooled df → 20 · Paired df, 12 pairs → 11
Cells - Welch df by hand · ±0 - Pooled df · ±0 - Paired df, 12 pairs · ±0 Welch: min(12 − 1, 10 − 1) = 9. Pooled: 12 + 10 − 2 = 20. Paired: n_d − 1 = 11 — one sample of 12 differences.
H-W7 and H-W9 (both routes on every example, REFERENCE for shape); Modules 9–13 df rules; original scenarios