Description Format References Examples
Durability of tennis ball covers
A data frame with 20 observations on the following 2 variables.
type
a factor with levels A
, B
, C
and D
wear
a numeric vector
Peter R. Nelson, Marie Coffin and Karen A. F. Copeland (2003), Introductory Statistics for Engineering Experimentation, Elsevier. (Appendix A)
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