Consumer Reports compared the effectiveness of an antiwrinkle cream with that of a plain moisturizer in reducing the appearance of wrinkles. The researchers enrolled 79 subjects with moderate to marked wrinkles, and instructed them to use both products, one on each side of the face, every morning for 12 weeks. The subjects didn't know which products they were using. At the end of the study, panelists examined before and after photos of the subjects to assess wrinkle appearance. The panelists did not know which product the subjects had used. Which of the following statements is TRUE?

Question

Quizplus · Accepted Answer

The study was an experiment in which two products were compared, and the subjects were randomly assigned to use one of the products on each side of their face. The study was also double-blind, meaning neither the subjects nor the panelists who evaluated the photos knew which product was used on each side of the face. Therefore, the correct answer is D.

Consumer Reports Compared the Effectiveness of an Antiwrinkle Cream with That