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)

Question

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The difference in lighting is not a controlled variable and was not intended to be a part of the study, therefore it is a confound that could potentially interfere with the results. The independent variable is the type of diet provided to the rats and the dependent variable is their performance in the maze. The hypothesis is the proposed relationship between the independent and dependent variables.

While Studying the Impact of Nutrition on Intelligence,a Researcher Has