Internal validity can be affected by all of the following,except:
A) Instrumentation
B) Testing
C) Differential investigation
D) Experimental mortality

Question

Quizplus · Accepted Answer

Differential investigation, also known as selection bias, affects external validity rather than internal validity. Instrumentation, testing, and experimental mortality all have a direct impact on the internal validity of a study.

Internal Validity Can Be Affected by All of the Following,except