In the Graph Below, All Preintervention Observations Are Less Favorable

question 15

Multiple Choice

In the graph below, all preintervention observations are less favorable than the post interventions observations;

• A) clearly the intervention had an impact.
• B) regression to the mean is the most likely reason for the change.
• C) the possible effects of maturation or history should be considered carefully.
• D) partial correlations should be calculated before drawing any conclusions.

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