Juan wants to compare the effectiveness of two drugs in treating migraines. He administers Drug A to a participant and then Drug B to the same participant eight hours later when Drug A is still in the participant's system. In this case, the study is contaminated by a _____ effect.
A)fatigue
B)carryover
C)order
D)practice

Question

Quizplus · Accepted Answer

The study is contaminated by a carryover effect. This occurs when the effects of the first treatment carry over and influence the outcome of the second treatment. In this case, Drug A is still in the participant's system when Drug B is administered, which could affect the effectiveness of Drug B.

Juan Wants to Compare the Effectiveness of Two Drugs in Treating