Prenatal Care The following data gives the percentage of women who smoked during pregnancy for...

Prenatal Care The following data gives the percentage of women who smoked during pregnancy for selected years from 1994 to 2002.

Year	Percent Smoking During Pregnancy
1994	14.6
1996	13.6
1998	12.9
2000	12.2
2001	12.0
2002	11.4

(a) From examining the table, what is the general relationship between the year and the percentage of women smoking during pregnancy?

(b) Let t be the number of years after 1993. Here, t starts at 1 because ln 0 is undefined. Make a scatterplot of the data and find the natural logarithmicfunction of the form p(t ) = a ln t + b that best fits the data. Why must a be negative?

(c) Project the percentage of women who will smoke during pregnancy in the year 2007