Ben conducts a study to test the effectiveness of an alcohol treatment program. He surveys the clients twice: once at intake and again six months later. He finds that overall, the treatment program was effective, but approximately 30% of the original sample dropped out of the program so he does not have posttest data for them. Ben has encountered which kind of problem?
A) Instrumentation
B) Mortality
C) Statistical regression
D) Diffusion of treatment

Question

Quizplus · Accepted Answer

Ben has encountered the problem of "mortality," which refers to the loss of participants from a study over time, leading to missing data for those individuals.

Ben Conducts a Study to Test the Effectiveness of an Alcohol