This data set contains the percentages of mothers in the United States from 2010 to 2014 who smoked during pregnancy for various categories of educational level. A subset of this data is displayed in Table 2.13 of Wolfe and Schneider - Intuitive Introductory Statistics.
data.frame with 40 rows and 4 columns indicating the education, births, and percentage of smoking mothers for each year.
Centers for Disease Control and Prevention (CDC) "WONDER Online Database" (2016)
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