water {EngrExpt}

Bacteria concentrations in water samples

Description

Bacteria concentrations in water samples

Format

A data frame with 50 observations on the following variable.

bacteria

bacteria concentration (ppm)

References

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

Examples

str(water)
qqmath(~ bacteria, water, aspect = 1,
       xlab = "Standard normal quantiles",
       ylab = "Bacteria concentration (ppm)")
histogram(~ bacteria, water, breaks = 0:14 - 0.5,
          xlab = "Bacteria concentration (ppm)")
xtabs(~ bacteria, water)