Safety violations over time

Description

Safety violations over time

Format

A data frame with 30 observations on the following 4 variables.

year

a numeric vector

place

a factor with levels CA, KY, MI, NY, TN and TX

employees

a numeric vector

cases

a numeric vector

References

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

Examples

1

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