In order to measure whether a message produced an attitude change when an after-only design was used,you should compare the attitudes of the people who received the message with
A) their attitudes toward similar issues.
B) their attitudes toward the same issue at least two weeks ago.
C) the attitudes of people who received the message two weeks after the first group.
D) the attitudes of people who did not receive the message.

Question

Quizplus · Accepted Answer

In an after-only design, it is important to have a control group that did not receive the message in order to determine if the attitude change is truly a result of the message and not due to other factors. Therefore, the attitudes of people who did not receive the message are the best comparison group.

In Order to Measure Whether a Message Produced an Attitude