A researcher is interested in whether circadian rhythms influence participants' performance on different kinds of memory tests.The researcher first classifies participants according to whether each is a morning person or an evening person.The researcher then randomly assigns participants to receive either an implicit memory test or an explicit memory test.The researcher then tests everyone at 8 a.m.What is(are) the main effect(s) being tested in the study?
A) type of person
B) memory test
C) type of person and performance
D) type of person and memory test

Question

Quizplus · Accepted Answer

The study is testing for the main effects of type of person (morning vs. evening) and memory test type (implicit vs. explicit). The main effect of type of person is being tested because the researcher classified participants into either morning or evening people. The main effect of memory test is being tested because participants were randomly assigned to either an implicit or explicit memory test. The main effect of performance is not being directly manipulated or tested in the study.

A Researcher Is Interested in Whether Circadian Rhythms Influence Participants