Question 2.308

12thsmokers

30. Cigarette use among 12th-Graders. Table 42 presents the percentages of 12th-graders who smoke cigarettes, for the years 1980–2009.

  1. Construct a time series plot of the data.
  2. Describe any trends that you see.

95

Table 2.99: TABLE 42 12th-graders who smoke
Year Percent Year Percent
1980 30.5 1995 33.5
1981 29.4 1996 34.0
1982 30.0 1997 36.5
1983 30.3 1998 35.1
1984 29.3 1999 34.6
1985 30.1 2000 31.4
1986 29.6 2001 29.5
1987 29.4 2002 26.7
1988 28.7 2003 24.4
1989 28.6 2004 25.0
1990 29.4 2005 23.2
1991 28.3 2006 21.6
1992 27.8 2007 21.6
1993 29.9 2008 20.4
1994 31.2 2009 20.1
Table 2.99: Source: Monitoring the Future study, University of Michigan.