When a change in the dependent variable could be due to an event beyond the researcher's control, _________ is a threat to internal validity.
A)history
B)maturation
C)regression to the mean
D)selection

Question

Quizplus · Accepted Answer

History refers to external events that may happen during a study that could affect the dependent variable and produce changes that are not related to the independent variable. Since these events are beyond the researcher's control, they pose a threat to the internal validity of the study. Maturation, regression to the mean, and selection are also threats to internal validity but they are not specifically related to external events beyond the researcher's control.

When a Change in the Dependent Variable Could Be Due