Some researchers have observed a greater airway resistance in smokers than in nonsmokers. Suppose a study, conducted

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Some researchers have observed a greater airway resistance in smokers than in nonsmokers. Suppose a study, conducted to compare the percent of tracheobronchial retention of particles in smoking-discordant monozygotic twins, yielded the following results:

Do these data support the hypothesis that tracheobronchial clearance is slower in smokers? Let . Determine the p value for this test.

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