A sociologist is studying influences on family size. He finds pairs of sisters, both of whom are married, and determines for each sister whether she has 0, 1, or 2 or more children. He wants to compare older and younger sisters. Explain what the following hypotheses mean and how to test them.
a. The number of children the younger sister has is independent of the number of children the older sister has.
b. The distribution of family sizes is the same for older and younger sisters. Could one hypothesis be true and the other false? Explain.
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