Data for Example 1.17
A data frame/tibble with 66 observations on the two variables
a character vector with values
a numeric vector indicating the level of lead in children's blood (in micrograms/dl)
Morton, D. et al. (1982), "Lead Absorption in Children of Employees in a Lead-Related Industry," American Journal of Epidemiology, 155, 549-555.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
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