Some threats to internal validity are related to time and other threats are related to differences between groups.What is a threat related to time?
A)history effects
B)assignment bias
C)selection bias
D)differential attrition

Question

Some threats to internal validity are related to time and other threats are related to differences between groups.What is a threat related to time?
A)​history effects
B)​assignment bias
C)selection bias
D)​differential attrition

Quizplus · Accepted Answer

History effects refer to changes that occur over time that are not due to the treatment being studied. For example, if a study is looking at the effectiveness of a new exercise program in reducing anxiety levels, changes in anxiety levels may also be due to events that occur during the study (such as a major news event or personal life changes) rather than the exercise program itself. This is a threat to the internal validity of the study.

Some Threats to Internal Validity Are Related to Time and Other