Initial and 1 month color measure of coated lens
A data frame with 23 observations on the following 2 variables.
a numeric vector of initial color measurements
a numeric vector of color measurements after one month
It is undesirable to see color changes in a lens over time.
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
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