In Professor John's three week experiment,the control group has realized that the experimental group is being exposed to lavish lunches as part of the experiment,while they are stuck with plain microwaved meals.In protest,they have decided to stop full participation.Which form of internal invalidity does Professor John have to worry about?
A)maturation
B)demoralization
C)selection biases
D)experimental mortality
E)statistical regression

Question

Quizplus · Accepted Answer

Demoralization occurs when the control group becomes aware of the benefits or advantages given to the experimental group, leading to a lack of motivation or withdrawal from the study.

In Professor John's Three Week Experiment,the Control Group Has Realized