Correct option is B
The correct answer is (b).
Introduction
ANCOVA compares group means while controlling for covariates. The logical sequence: collect data (B), control for confounders (C), apply ANCOVA adjustment (A), then analyse adjusted differences (D). Hence B, C, A, D.
Information Booster
- B: Collect data on DV and covariates.
- C: Identify and include confounders as covariates.
- A: Apply ANCOVA to adjust group means.
- D: Interpret adjusted differences for intervention effect.
- Option A starts with analysis prematurely.
- Option C begins with controlling before data collection.
- Option D starts with application before data collection.
ANCOVA increases statistical power by reducing error variance.