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Sex Ratio

    Sex Ratio. The normal male to female live birth sex ratio ranges from about 1.03 to 1.07. The sex ratio is defined as the ratio of male births to female births. You might expect boy and girl births to be equally likely, but in fact, baby boys are somewhat more common than baby girls. Higher sex ratios are thought to reflect prenatal sex selection, especially among cultures where sons are prized more heavily than daughters.

    We will review sex ratios in the United States as a whole, as well as in individual states, to determine whether sex ratios vary significantly among various ethnic and racial groups. To do this analysis, we will utilize natality data for the United States, provided by the Centers for Disease Control. In the first part of the assignment, we will look at sex ratios for your home state, over the time period 1995 to 2002, by race. To obtain this information: Go to the CDC Wonder website, Click on Births under the WONDER Online Databases to bring you to the Natality Information screen

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