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Question

# 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.

Solution

Verified

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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