In a study of human development, investigators showed two movies that were different types to groups of children. Crackers were available in a bowl, and the investigators compared the number of crackers eaten by children watching both movies. One movie was shown at 8 AM (right after the children had breakfast) and the other at 11 AM (right before the children had lunch). It was found that during the movie shown at 11 AM, more crackers were eaten than during the movie shown at 8 AM. The investigators concluded that the different types of movies had different effects on appetite. Two variables in a study are said to be confounded if A. one cannot separate their effects on a response variable. B. they are highly correlated. C. they do not have a normal distribution. D. one of them is a placebo.
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(A). Confounded variables both impact the response, and without a proper experiment, you will be unable to determine whether your chosen independent/experimental variable istruly having the same effect. Here the experiment lacks control... the hunger of students right before lunch is going to generally impact the results.