How might regression artifacts have been avoided in the Westinghouse-Ohio evaluation of Head Start?
A) matching groups based on a pre-test score
B) replicating the experiments in another locale
C) randomly assigning the participants
D) ignoring selection of participants based on socioeconomic status

Question

Quizplus · Accepted Answer

Randomly assigning participants helps to avoid regression artifacts by ensuring that any differences between groups are due to the intervention rather than pre-existing differences.

How Might Regression Artifacts Have Been Avoided in the Westinghouse-Ohio