While studying the impact of nutrition on intelligence, a researcher has one group of rats on a vitamin-rich diet while the other rat group eats Big Macs. While observing the rats run a complicated maze, the researcher notes that the vitamin-enhanced rats' maze is more brightly lit than the Big Mac rats' maze. The difference in lighting in this study is a(n)
a. confound.
b. independent variable.
c. dependent variable.
d. hypothesis.
Question 2
A researcher is testing the effects of sunlight on depression. The dependent variable is
a. sunlight.
b. the interaction between sunlight and mood.
c. the research design.
d. depression.
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