Events or influences other than the experimental treatment itself may occur between a pretest and a posttest that may affect the dependent variable.This threat is called
A) mortality.
B) history.
C) regression.
D) diffusion.
E) Hawthorne effect.

Question

Quizplus · Accepted Answer

The threat described is called history, as it refers to external events or influences that may occur between the pretest and posttest, such as social or cultural changes, that could affect the dependent variable. Mortality refers to participants dropping out of the study, regression refers to extreme scores regressing to the mean, diffusion refers to treatment effects spreading to the control group, and the Hawthorne effect refers to participants altering their behavior due to awareness of being studied.

Events or Influences Other Than the Experimental Treatment Itself May