Kenny performed an experiment on the effects of after-school educational activities on students' academic performance.His experimental group involved after-school educational activities and his control group involved after-school non-educational activities.The children in the control group felt left out and gave up on the experiment.Which source of internal invalidity is reflected?
A)instrumentation
B)testing
C)statistical regression
D)demoralization
E)history

Question

Quizplus · Accepted Answer

This scenario reflects the internal validity threat of demoralization. The control group's feelings of being left out led them to give up, which could affect their academic performance and confound the results of the study.

Kenny Performed an Experiment on the Effects of After-School Educational