Sex composition patterns of children in families. In having children, is there a genetic factor that causes some families to favor one sex over the other? That is, does having boys or girls “run in the family”? This was the question of interest in Chance (Fall 2001). Using data collected on children’s sex for over 4,000 American families that had at least two children, the researchers compiled the accompanying table. Make an inference about whether having boys or girls “runs in the family.”

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Sex Composition of First Two Children Boy-Boy Boy-Girl Girl-Boy Girl-Girl Total Frequency 1,085 1,086 1,111 926 4,208