Data for Example 2.18 and Exercise 9.34
A data frame/tibble with 19 observations on two variables
tensile strength of kraft paper (in pounds per square inch)
percent of hardwood in the batch of pulp that was used to produce the paper
G. Joglekar, et al., "Lack-of-Fit Testing When Replicates Are Not Available," The American Statistician, 43(3), (1989), 135-143.
Kitchens, L. J. (2003) Basic Statistics and Data Analysis. Pacific Grove, CA: Brooks/Cole, a division of Thomson Learning.