Human Demography Problem Set

Human Demography Problem Set - 5. Sampling biases may occur...

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Survivorship Curve 1. 2. The general shape of the curves is the same: however, it appears that survivorship declines for both genders, compared with the survivorship of individuals born before 1890. The greatest decline is seen for males when comparing those born before 1890, and those born after 1890. 3. The changes in life expectancy generally decrease, within genders, for those born before 1890 to those born after 1890. Life expectance for females is also generally less than that of males. 4. The reasons for the patterns observed may be that perhaps life expectancy between two groups of people born in different time periods has not changed, and the data obtained does not represent the life expectancy for the Chapel Hill area as a whole. Because of increased mobility in today’s world, older people may choose to retire in Florida or elsewhere instead of remaining in the same town their entire lives, and those who stay in Chapel Hill tend to die at a younger age or live a very traditional lifestyle.
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Unformatted text preview: 5. Sampling biases may occur because the names on the grave markers suggest that those buried in the Chapel Hill cemetery were perhaps most, if not all, white, Anglo-Saxon, Protestant individuals. Although this demographic may represent the majority of Chapel Hill, it does not account for all people living in Chapel Hill, and thus is not a true random sample. The people buried in the cemetery may have been those with connections to the university, or people of a high standing in society, and if that is the case, then this is also not a random sample. In addition, older grave markers were illegible, discounting them from the sample of those born before 1890. These sampling biases may have increased the actual calculated values of survivorship and life expectancy, as dietary and exercise habits in less affluent demographic groups may cause the life expectancy of those groups to decrease and, overall, decrease the survivorship and life expectancy of the population as a whole....
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This note was uploaded on 11/05/2011 for the course BIOL 201 taught by Professor Mitchell during the Fall '07 term at UNC.

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