The following data represent the percentage of families in the United States whose income is below the poverty level.

                             Year    …………………………….. Percent below Poverty Level, p

1990    ……………………………………………..….. 10.9

1991    ……………………………………………..….. 11.5

1992    ……………………………………………..….. 11.9

1993    ……………………………………………..….. 12.3

1994    ……………………………………………..….. 11.6

1995    ……………………………………………..….. 10.8

1996    ……………………………………………..….. 11.0

1997    ……………………………………………..….. 10.3

1998    ……………………………………………..….. 10.0

1999    ……………………………………………..….. 9.3

2000    ……………………………………………..….. 8.7

2001    ……………………………………………..….. 9.2

2002    ……………………………………………..….. 9.6

2003    ……………………………………………..….. 10.0

2004    ……………………………………………..….. 10.2

(a) With a graphing utility, draw a scatter diagram of the data. Comment on the type of relation that appears to exist between the two  variables.

(b) Decide on a function of best fit to these data (linear, quadratic, or cubic), and use this function to predict the percentage of U.S. families that were below the poverty level in 2005 (t = 16).

(c) Draw the function of best fit on the scatter diagram drawn in part (a).