Companies often use testimonials to promote their products. Suppose
that you encountered the following testimonials for a new weight-loss
From a movie star, "I lost 20 pounds without dieting using
From a research scientist at Your State University: "Our research
shows that subjects taking these pills lose an average of 12 pounds
in 4 weeks".
From a professional baseball player, "I've tried all of the
diet pills, and these are the only ones that have worked for me."
From a scientist at the pharmaceutical company that makes the pills,
"This is the most advance weight loss formula on the market".
- Which of these testimonials is most convincing?
- How do testimonials differ from the experimental
designs discussed in this lesson?
- Can you translate these testimonials
into a testable hypothesis?
- What experimental design would effectively test
the hypothesis you describe?