______ can be a source of bias in the study if the participants who drop out are different from the participants who remain.
A) Attrition
B) Erosion
C) Corrosion
D) Deterioration

Question

Quizplus · Accepted Answer

Attrition refers to the loss of participants during a study. If those who drop out are different from those who remain, this can lead to bias in the results. For example, if participants with more severe symptoms drop out of a treatment study, the remaining group may appear to respond better to the treatment than if those participants had stayed in the study.

______ Can Be a Source of Bias in the Study