A researcher studies a new mathematics program. At the beginning of the year, 100 students are randomly assigned to receive a new program and 100 students are randomly assigned to use the previously used mathematics program. The participants are pretested at the beginning of the year, and they are posttested at the end. What kind of experimental design did the researcher use?
A) Pretest-posttest control-group design
B) Posttest-only design with nonequivalent groups
C) One-group posttest-only design
D) Posttest-only control-group design

Question

Quizplus · Accepted Answer

The researcher used a pretest-posttest control-group design because the participants were randomly assigned to two groups (new program and previously used program), and they were pretested and posttested.

A Researcher Studies a New Mathematics Program