Figure 10 shows a time-series graph for the death rate (deaths per 1,000 people) in the United States since 1900. (For example, the 1905 death rate of 16 means that, for each 1,000 people living at the beginning of 1905, 16 people died during the year.) Discuss the general trend. Also consider the spike in 1918: If someone told you that this spike was due to battlefield deaths in World War I, would you believe it? Explain.

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Rate 20 15 1100 Death Rates per 1,000 Population 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 Year Figure 10 Historical U.S. death rates per 1,000 people. 2010