Description

De-inking of newsprint

Format

A data frame with 15 observations on the following 3 variables.

formula

a factor with levels A, B and C

newspaper

a factor with levels A, B, C, D and E

bright

a numeric vector

Details

One step of recycling newsprint is to "de-ink" the newsprint, that is to remove the ink. The brightness of the paper pulp after a de-inking process is a measure of how well the process to remove the ink worked. In this experiment three formulations were tested on three newspapers (not all newsprint and ink are identical).

References

Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)

Examples