A Researcher Conducts a Study and Concludes That a New

Multiple Choice

A researcher conducts a study and concludes that a new behavioral health treatment program significantly reduces one's risk for disease compared with risk levels in the general population (d = -0.64) .Interpret the size of this effect.

A) 64% of the variability in risk level can be accounted for by the new treatment.
B) 64% of the new treatment can be accounted for by the risk levels.
C) Risk levels in the population shifted 0.64 standard deviations below the mean.
D) Risk levels in the population shifted 0.64 standard deviations above the mean.