Data Collectionhard
0:00.0
A randomized controlled trial compares pain management methods A and B in 100 patients (50 per arm). Baseline pain (covariate X) is balanced due to randomization. Summary statistics:
- Group A: Pre-pain mean = 7.2, Post-pain mean = 2.8
- Group B: Pre-pain mean = 7.1, Post-pain mean = 3.5
- Pooled regression slope (baseline → post, both groups):
- Residual variance (within groups):
Using ANCOVA to adjust for baseline pain, which statements are correct?
A randomized controlled trial compares pain management methods A and B in 100 patients (50 per arm). Baseline pain (covariate X) is balanced due to randomization. Summary statistics:
- Group A: Pre-pain mean = 7.2, Post-pain mean = 2.8
- Group B: Pre-pain mean = 7.1, Post-pain mean = 3.5
- Pooled regression slope (baseline → post, both groups):
- Residual variance (within groups):
Using ANCOVA to adjust for baseline pain, which statements are correct?