Chapter 10.CR, Problem 11CR

The life expectancies at birth for males and females in the United States are approximated in the following table:

Year	Male	Female	Year	Male	Female
1970	67.1	74.7	1991	72.0	78.9
1971	67.4	75.0	1992	72.1	78.9
1972	67.4	75.1	1993	72.1	78.9
1973	67.6	75.3	1994	72.4	79.0
1974	68.2	75.9	1995	72.5	78.9
1975	68.8	76.6	1996	73.1	79.1
1976	69.1	76.8	1997	73.6	79.2
1977	69.5	77.2	1998	73.8	79.5
1978	67.6	77.3	1999	73.9	79.4
1979	70.0	77.8	2000	74.1	79.3
1980	70.0	77.5	2001	74.2	79.4
1981	70.4	77.8	2002	74.3	79.5
1982	70.9	78.1	2003	74.5	79.6
1983	71.0	78.1	2004	74.9	79.9
1984	71.2	78.2	2005	75.9	79.9
1985	71.2	78.2	2006	75.1	80.2
1986	71.3	78.3	2007	75.4	80.4
1987	71.5	78.4	2008	75.6	80.6
1988	71.5	78.3	2009	76.0	80.9
1989	71.7	78.5	2010	76.2	81.0
1990	71.8	78.8	2011	76.3	81.1

Source: The world Almanac, 2014. National Center for health Statistics.

a. Draw back to back ordered stem and leaf plots to compare the data.

b. Draw box plots to compare the data.