When events that occur during the course of a study have a different effect on one group of participants than on another,the possible threat to internal validity is
A) differential regression.
B) selection.
C) history.
D) additive effects of selection and history.

Question

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The Answer of When events that occur during the course of a study have a different effect on one group of participants than on another,the possible threat to internal validity is
A) differential regression.
B) selection.
C) history.
D) additive effects of selection and history.

When Events That Occur During the Course of a Study