Buchanan, Tranel, and Kirchbaum (2009) studied three groups of participants, one of which had damage to the hippocampus, one that had similar brain damage but not to the hippocampus, and a control group of participants. The researchers assessed responses to the three groups both before and after they were exposed to stress. The hippocampus group showed a decrease in cortisol response to stress, whereas the other two groups shoed increases. Which of the following statistical tests was used to test the hypothesis?

Question

Quizplus · Accepted Answer

The correct statistical test for examining how different groups respond to a condition (before and after stress) and specifically looking at how these responses differ across groups (hippocampus damage, other brain damage, and control) is an interaction. This test assesses how the effect of one variable (stress) differs depending on the level of another variable (group).

Buchanan, Tranel, and Kirchbaum (2009) Studied Three Groups of Participants