Companies often use testimonials to promote their products. Suppose that you encountered the following testimonials for a new weight-loss pill.

From a movie star, "I lost 20 pounds without dieting using these pills".

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?

Click here to continue.