How is the value of the correlation affected

Reference no: EM131401544

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.

Reference no: EM131401544

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