Mortality rates in the united states during the 1980s and, Ask an Expert

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Mortality rates in the United States during the 1980s and 1990s were studied by county, race, gender, and income, with the following results: "Asian-Americans, average per-capita income of $21,566, have a life expectancy of 84.9 years . . . Western American Indians, $10,029, 72.7 years . . ."8 Are these numbers referring to samples or populations?

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