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In a recent Harris Poll, a random sample of adult Americans (18 years and older) was asked, "When you see an ad emphasizing that a product is 'Made in America,' are you more likely to buy it, less likely to buy it, or neither more nor less likely to buy it?" The results of the survey, by age group, are presented in the contingency table below.
How many adult Americans were surveyed? How many were 55 and older?
A student in an exercise science program wishes to study dietary habits of married couples. She surveys married couples from her local gym and asks them (individually) what percent of their daily calories are from fat. She analyzes the results using the Wilcoxon signed-ranks test. Explain why her results are questionable.
The reason her results are questionable is because she only surveyed married couples from her local gym. Not only is her data not randomly selected, but the sample also isn't representative of the population. Extrapolating her results to the entire population of married couples would imply that all married couples go to the gym, or at least have the same dietary habits as married couples from her local gym.
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