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Birth order revisited. Consider again the data on birth order and college majors in Exercise 28.

a) What is the marginal distribution of majors?

b) What is the conditional distribution of majors for the oldest children?

c) What is the conditional distribution of majors for the children born second?

d) Do you think that college major appears to be independent of birth order? Explain.

Exercise 28

Birth order. Is your birth order related to your choice of major? A Statistics professor at a large university polled his students to find out what their majors were and what position they held in the family birth order. The results are summarized in the table.

a) What percent of these students are oldest or only children?

b) What percent of Humanities majors are oldest children?

c) What percent of oldest children are Humanities students?

d) What percent of the students are oldest children majoring in the Humanities?

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