While studying the impact of ginkgo biloba on memory, a researcher has one group of rats on a normal diet while the other rat group is given measured doses of ginkgo biloba with their meals. while observing the rats run a complicated maze, the researcher notes that the ginkgo biloba-enhanced rats’ maze is more brightly lit than the normal diet rats’ maze. the difference in lighting in this study is a(n)
a. confound.
b. dependent variable.
c. hypothesis.
d. independent variable.

D. independent variable.

Explanation:

According to my research on different experimental terminology, I can say that based on the information provided within the question the difference in lighting in this study is an independent variable. This is because the focus of the study seems to be whether a certain diet affects the rats abilities and speed in finishing the maze. The results for this study do not depend on the lighting because rats can navigate in the dark just as fast as in the dark because of their whiskers.

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