Nora is interested in differences in amount of content retained from a lecture based on time of class. She compares her two sections.Section Ameets at 8 am and Section B meets at 2 pm. She testsstudentsin both sections, unannounced, on content that she taught two weeks ago. Which of the following designs is Nora best illustrating?

Answer choices:

a. One-group post-test only design

b. One group pretest-posttest design

c. Nonequivalent control group design

d. Posttest- only design with non-equivalentgroups