2.5 solutions

# Pstudent smokesneither parent smokes 188 1356 1386

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P(student smokes|neither parent smokes) = 188 1356 =.1386 P(student smokes|one parent smokes) = 416 2239 = .186 2

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P(student smokes|both parents smoke)= 400 1780 =.225 P(student smokes) = .187 There is an association between students and parents smoking. If both parents smoke, there is an increased chance the student smokes. If neither parent smokes there is a decreased chance the student smokes. 722 randomly selected students in a business school were asked what their major was. Half the students were males and half were females . Females* Major Males* Major Category Accounting Admin Econ Finance Pie Chart of Females, Males vs Major 11. The pie charts shown above represent what distribution? a. They represent the marginal distribution of gender b. They represent the marginal distribution of major c. They represent the conditional distribution of gender given major. d. They represent the conditional distribution of major given gender. 12. There appears to be an association between gender and major. Explain why, using info from the above pie charts. (Note percentages are not given; just describe them as best you can; this happens sometimes in the ‘real world’.) Females have more administrative majors than males; males have more Accounting majors than females. 3
Mike and Matt are on a baseball team. They keep track of their batting statistics for two seasons. They count the number of times they got a hit, and the number of times they were at bat (that means the number of times they attempted to make a hit.) The
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