Problem 1

A study of human development showed two types of movies to a group of children. Chips were available in a bowl, and the investigators compared the number of chips eaten by the children while watching the different kinds of movies. One kind was shown at 8 A.M. and another at 11 A.M. It was found that during the movie shown at 11 A.M., more chips were eaten than during the movie shown at 8 A.M. The investigators concluded that the different types of movies had an effect on appetite.

(a) The explanatory variable in this experiment is

1. type of chip.
2. type of movie.
3. hunger level.
4. None of the above.

(b) The response variable in this experiment is

1. the time the movie was shown.
2. the bowls.
3. the different kinds of movies.
4. the number of chips eaten.

(c) A lurking variable in this experiment is

1. the different kinds of movies.
2. the number of chips eaten.
3. the bowls.
4. the time the movie was shown.