Smoking and pregnancy 2003. The organization Kids Count monitors issues related to children. The table shows a 50-state average of the percent of expectant mothers who smoked cigarettes during their pregnancies.
|
Year
|
% Smoking While Pregnant
|
Year
|
% Smoking while Pregnant
|
|
1990
|
19.2
|
1997
|
14.9
|
|
1991
|
18.7
|
1998
|
14.8
|
|
1992
|
17.9
|
1999
|
14.1
|
|
1993
|
16.8
|
2000
|
14.0
|
|
1994
|
16.0
|
2001
|
13.8
|
|
1995
|
15.4
|
2002
|
13.3
|
|
1996
|
15.3
|
2003
|
12.7
|
a) Create a scatterplot and describe the trend you see.
b) Find the correlation.
c) How is the value of the correlation affected by the fact that the data are averages rather than percentages for each of the 50 states?
d) Write a linear model and interpret the slope in this context.