Milligrams of tar in 25 cigarettes selected randomly from 4 different brands
Data for Example 10.4
Cigar
A data frame/tibble with 100 observations on two variables
amount of tar (measured in milligrams)
a factor indicating cigarette brand with levels brandA, brandB,
brandC, and brandD
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
boxplot(tar ~ brand, data = Cigar, col = "cyan", ylab = "mg tar") anova(lm(tar ~ brand, data = Cigar))
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