Concrete {BSDA}

Compressive strength of concrete blocks made by two different methods

Description

Data for Example 7.17

Usage

Concrete

Format

A data frame/tibble with 20 observations on two variables

strength

comprehensive strength (in pounds per square inch)

method

factor with levels new and old indicating the method used to construct a concrete block

References

Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.

Examples

wilcox.test(strength ~ method, data = Concrete, alternative = "greater")