Compressive strength of concrete blocks made by two different methods
Data for Example 7.17
Concrete
A data frame/tibble with 20 observations on two variables
comprehensive strength (in pounds per square inch)
factor with levels new and old indicating the
method used to construct a concrete block
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.
wilcox.test(strength ~ method, data = Concrete, alternative = "greater")
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