In research studies that compare different groups of individuals for each of the treatment conditions,____ is a threat to internal validity.
A)time
B)assignment bias
C)novelty
D)sensitivity

Question

In research studies that compare different groups of individuals for each of the treatment conditions,____ is a threat to internal validity.
A)​time
B)​assignment bias
C)novelty
D)​sensitivity

Quizplus · Accepted Answer

Assignment bias refers to the systematic differences between groups that arise due to the non-random assignment of individuals to different treatment conditions. This can threaten the internal validity of research studies as it makes it difficult to determine whether differences observed between groups are due to the treatment or to the characteristics of the individuals in those groups. Time, novelty, and sensitivity are other factors that can potentially affect validity but are not directly related to the assignment of individuals to treatment conditions.

In Research Studies That Compare Different Groups of Individuals for Each