Question

explain how are these two graphs are different

108 CHAPTER 6 AIDS Cases in the United States, by Year 120.000 100.000 20.000 0 000 40.000 20.000 1987 1988 1980 1999 1661 1992 1994 6661 1978-85 S88L 1996 1998 1997 2000 1999 1002 2002 DOO POOC 1.200,000 AIDS Cases in the United States, Cumulative Since 1978 Deaths 1,000,000 Cases 800,000 600,000 400,000 - 200,000 OL 1978-85 1986 1987 1988 1989 0661 1661 2661 €661 1994 1995 1996 1997 1998 1999 2007 2008 2010 Figure 6-1 Appearance of AIDS in the United States. Data compiled from reports from the U.S. Centers for Disease Control and Prevention. In 1993, the definition for AIDS was expanded to include any HIV-positive person with a Telecount of less than 200 per cubic millimeter of blood. This accounts for the jump in the number of reported AIDS cases beginning in 1993. Data for all subsequent years use this new definition (designated by on the graphs). (Data from CDC, HIV/AIDS Surveillance Reports.)

Answer 1

The first graph showing the number of AIDS cases every year. It is showing the number of cases and the number of deaths for each year starting from 1978 to 2010.

But the second graph is showing the cumulative number of AIDS cases every year. Cumulative means addition. In 1978, it is showing the number of cases occurring only in 1978. But in 1979, it is showing the number of cases in both 1978 and in 1979. In 1980, it is showing the number of cases in 1978, 1979 and 1980. This is how the graph is proceeding till 2010.

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