A professor invites students who did poorly on the first test to attend a special review session before the second test.Most do better on the second test.What kind of research is this?
A)A before-and-after study
B)A single-blind experiment
C)A double-blind experiment
D)A case history

Question

A professor invites students who did poorly on the first test to attend a special review session before the second test.Most do better on the second test.What kind of research is this?​
A)A before-and-after study
B)​A single-blind experiment
C)​A double-blind experiment
D)​A case history

Quizplus · Accepted Answer

This is a before-and-after study because the same group of students is being compared before and after the intervention of attending the review session. There is no control group, so it is not a true experiment with manipulation and comparison of groups. It is also not single-blind or double-blind because there is no blinding involved.

A Professor Invites Students Who Did Poorly on the First