Examine life expectations (in years) at birth for various countries across the world. These data can be

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Examine life expectations (in years) at birth for various countries across the world. These data can be found in the file P3_62.XLS.

a. Generate an estimate of the typical human’s life span at birth using the 1997 data. What are the limitations of the method you have employed in estimating this world population parameter?

b. Characterize the variability of the life spans at birth using the 1997 data. Is this distribution fairly symmetric or skewed? How do you know?

c. How strongly are the 1997 life expectations associated with projections for births in 2000 and 2010? Explain why the degree of linear association between the 1997 data and each set of projections diminishes somewhat over time.

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