In a Study on the Effects of Caffeine on Reaction

Multiple Choice

In a study on the effects of caffeine on reaction time, one group of participants ingests two cups of coffee before being tested. A second group takes four cups, and a third group takes eight cups. Before the study, participants are asked about the average number of cups they drink per day and that information is used when assigning participants to groups. What is the design?

A) multilevel, matched groups
B) independent groups, single factor
C) repeated measures, multilevel
D) multilevel, nonequivalent groups