Subjects in a multiple group experimental study are tested for how much time it takes them to navigate a maze and find the chocolate. The maze is reconstructed after each run, and three different floor plans are used. Each group is tested eight times in 8 hours at a different time of day. The runs later in the day have faster times than the earlier ones. Which threat to internal validity might account for this difference?

Question

Quizplus · Accepted Answer

Testing effects might account for this difference because the subjects are likely becoming more familiar with the task over time, which could lead to faster completion times. This is a common issue in studies where participants are tested multiple times.

Subjects in a Multiple Group Experimental Study Are Tested for How