A researcher is interested in the effects of drinking different amounts of alcohol on a person's ability to perform a mental arithmetic task. Which of the following would be a problem for this researcher if she wanted to use a within-subjects design with counterbalancing?
A) She would be unable to control participants' levels of intelligence.
B) There would be a severe fatigue effect.
C) There would probably be placebo effects.
D) She would probably have to test each participant on two different days.

Question

Quizplus · Accepted Answer

Using a within-subjects design with counterbalancing requires testing each participant on at least two different conditions. In this case, the researcher would have to test each participant on a mental arithmetic task under both the influence of alcohol and without alcohol. This may require testing each participant on two different days to avoid carryover effects (such as hangovers) that could affect performance on subsequent trials.

A Researcher Is Interested in the Effects of Drinking Different