Data for Exercise 10.58
A data frame/tibblewith 51 observations on two variables
time (measured in days) until an arthritis sufferer experienced relief
a factor with levels
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
boxplot(time ~ treatment, data = Arthriti, col = c("lightblue", "lightgreen", "yellow"), ylab = "days") anova(lm(time ~ treatment, data = Arthriti))
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