Observational Studies and Experiments — Quiz

Question 8 • Statistics and Probability

Which method describes an experiment?

Answer

Method 1 is an experiment because all volunteers receive coats with the new insulation.

Method 2 is an experiment because both groups report their satisfaction with the coats.

Method 2 is an experiment because volunteers are assigned one of the two insulation types.

Method 1 is an experiment because the volunteers’ satisfaction with the new insulation can be measured.

Explanation

An experiment involves assigning participants to different treatments so the effects can be compared. In Method 2, volunteers are assigned one of the two insulation types, so the researchers can compare satisfaction between the groups. Simply measuring satisfaction, as in the other choices, does not by itself make a study an experiment.

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