Question

ch 9 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 treatment in this experiment is
the bowls.

the different kinds of movies.

the number of crackers eaten.

the time each movie was shown.

Explanation:

In an experiment, the treatment is the factor that is manipulated by the experimenter. Here, the investigators wanted to see the effect of different movie types on appetite, so they manipulated the type of movies shown (the independent variable, or treatment). The bowls are just a container, the number of crackers eaten is the response variable (dependent), and the time is a confounding variable here, but the treatment is the manipulated factor (different movies).

Answer:

the different kinds of movies.