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Exercise 13.021. An airline industry trade group would like to estimate the pro portion of Americans who are afraid to y. Suppose that the group

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Exercise 13.021. An airline industry trade group would like to estimate the pro portion of Americans who are afraid to y. Suppose that the group conducts a survey on this topic by randomly sampling individuals at airports throughout the country. Why might their sample be biased? (Hint: the result of sample selection is a biased sample)

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