In one research study, half of a class was told to watch 1 hour of television ea

Question

In one research study, half of a class was told to watch 1 hour of television each day. The other half of the class was instructed to watch 5 hours of television each day. Afterwards, the average grades for each half of a class were compared with each other. In a second research study, all the students of a class gave their responses to a set of questions that asked about their television viewing habits and also about their grades in the class.     

Which of the following statements is true?

A) The first research study was an observational study, while the second was a controlled experiment.

B) The first research study was an experiment without a control group, while the second study was an observational study.

C) Both research studies were controlled experiments.

D) Both research studies were observational studies.

E) Each research study was part controlled experiment and part observational study.

Explanation / Answer

The first research study was an experiment without a control group, while the second study was an observational study.

Option B is correct.

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