When the initial measurement alerts subjects to the nature of the experiment, distorting future treatments and measurements, it is called the:
A) selection effect.
B) cohort effect.
C) maturation effect.
D) testing effect.

Question

Quizplus · Accepted Answer

The testing effect occurs when the initial measurement (test) alters the behavior of the subjects, leading to distorted future results. This happens because the subjects become more aware of the experiment and may alter their behavior accordingly. A selection effect refers to biases that arise from non-random selection of subjects, a cohort effect arises from being born at a particular time and maturation effect refers to changes that occur naturally over time.

When the Initial Measurement Alerts Subjects to the Nature of the Experiment