water: Bacteria concentrations in water samples

In EngrExpt: Data sets from "Introductory Statistics for Engineering Experimentation"

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)

Example output

Loading required package: lattice
'data.frame':	50 obs. of  1 variable:
 $ bacteria: int  8 0 0 0 2 1 0 0 0 4 ...
bacteria
 0  1  2  3  4  5  6  8  9 13 
18 12  3  3  6  2  2  2  1  1 

EngrExpt documentation built on May 1, 2019, 9:15 p.m.