A news release for a diet product company reports: "There's good news for the 65 million Americans currently on a diet." Its own study showed that people who lose weight can keep it off. The sample was 20 graduates of the company's program who endorsed the program in commercials. The results of the sample are probably:
A)biased, overstating the effectiveness of the diet.
B)biased, understating the effectiveness of the diet.
C)unbiased, because the people in the sample are nationally recognized individuals.
D)unbiased, but they could be more accurate if a larger sample size was used.

Question

Quizplus · Accepted Answer

The sample is biased because it only includes graduates of the company's program who have endorsed it in commercials, which suggests their opinions may be influenced by potential financial gain or loyalty to the company. Therefore, the results may overstate the effectiveness of the diet and cannot be generalized to the broader population of people on diets.

A News Release for a Diet Product Company Reports: "There's