Martina believes that high doses of caffeine slow a person's reaction time. To test this belief,she has five friends each drink three 8-ounce cups of coffee and then measures their reaction time on a learning task. What is wrong with Martina's research strategy?

Question

Quizplus · Accepted Answer

Martina's research strategy lacks a control group. Without a control group, it is difficult to determine whether any changes in reaction time are due to caffeine or other factors, such as fatigue or individual differences in learning ability. A control group that receives no caffeine would allow for a comparison of reaction times between those who received caffeine and those who did not.

Martina Believes That High Doses of Caffeine Slow a Person's