The common feature of all before-and-after designs is:
A) Deliberate assignment is used to determine control and experimental groups
B) All cases receive the experimental treatment
C) Pretests are given to only half of the subjects
D) Group assignment occurs through matching
E) Multiple groups are used as experimental and control groups

Question

Quizplus · Accepted Answer

Before-and-after designs involve all cases receiving the experimental treatment, with measurements taken both before and after the intervention to assess its effects.

The Common Feature of All Before-And-After Designs Is