If an experimental treatment had different effects on subjects of different ages,we would conclude that:
A) there was a confounding in the study
B) there was an interaction
C) the study lacked external validity
D) a longitudinal design is more appropriate

Question

Quizplus · Accepted Answer

An interaction occurs when the effect of one variable (e.g., experimental treatment) differs depending on the level of another variable (e.g., age of subjects). This means the impact of the treatment is not uniform across all subjects but varies with their age, indicating an interaction between the treatment and age.

If an Experimental Treatment Had Different Effects on Subjects of Different