In a study of human development, investigators showed two different types of mov

Question

In a study of human development, investigators showed two different types of movies 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 A.M. (right after the children had breakfast) and the other at 11 A.M. (right before the children had lunch). It was found that during the movie shown at 11 A.M., more crackers were eaten than during the movie shown at 8 A.M. The investigators concluded that the different types of movies had different effects on appetite. The results cannot be trusted because:

1.the study was not double blind. Neither the investigators nor the children should have been aware of which movie was being shown.

2. the investigators were biased. They knew beforehand what the study would show.

3. the investigators should have used several bowls, with crackers randomly placed in each.

4. the time each movie was shown is a confounding variable.

Explanation / Answer

In statistics, a confounding variable (alsoconfounding factor, a confound, a lurkingvariable or a confounder) is a variable in a statistical model that correlates (directly or inversely) with both the dependent variableand an independent variable, in a way that "explains away" some or all of the correlation between . Time here have affect on both the movies as after breakfast student will have less and before lunch they will have more.

so answer is 4

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