Question

Does the type of program people watch influence how much they cal? A total of 94 college students were randomly assigned to one of three treatments: watching 20 minutes of a Hollywood action movie (The Island), watching the same 20 minute excerpt of the movie with no sound, and watching 20 minutes of an interview program. While watching, participants were given snacks (M&M'S®, cookies, carrots, and grapes) and allowed to eat as much as they wanted. Subjects who watched the highly stimulating excerpt from The Island ate 65% more calories than subjects who watched the interview show. Participants who watched the silent version of The Island ate 46% more calories than those who watched the interview show.

What are the explanatory and response variables? Is it an experiment or an observational study?

A) The explanatory variable is the type of program the people watched. The response variable is type of snack consumed This was an experiment.

B)The explanatory variable is the number of calories consumed. The response variable is the type of program the people watched. This was an experiment.

C)The explanatory variable is the type of program the people watched. The response variable is the number of calories
consumed. This was an experiment.

D)The explanatory variable is the type of program the people watched. The response variable is the number of calories consumed. This was an observational study.

E) The explanatory variable is the number of calories consumed. The response variable is the type of program the people watched. This was an observational study.

Answer 1

The explanatory variable is the type of program watched, and the response variable is the number of calories consumed. It is an experiment due to the random assignment and control of variables.

Step-by-step explanation:

The explanatory variable in the study is the type of program the people watched, which includes three treatments: watching an action Hollywood movie with sound, watching the movie without sound, and watching an interview program.

The response variable is the number of calories consumed by the participants while watching these programs. The nature of the study, with subjects being randomly assigned to one of three treatments and the variable of interest being controlled by the experimenter, indicates that this was an experiment, not an observational study.

The population of interest is all college students, the sample is the 94 college students who participated in the study, and each individual participant serves as an experimental unit.