bacteria: Bacteria count in water samples

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

Description

As described in Nelson, Coffin and Copeland (2003), “Purified water is used in one step in the production of a medical device. The water is tested daily for bacteria. These data are the results from 50 days of testing. They are the counts of a particular strain of bacteria in a 100 ml. sample of water.”

Format

A data frame with 50 observations on the following variable.

level

bacteria count

References

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

Examples

str(bacteria)
qqmath(~ level, bacteria, aspect = 1,
       xlab = "Standard normal quantiles",
       ylab = "Bacteria count")

Example output

Loading required package: lattice
'data.frame':	50 obs. of  1 variable:
 $ level: int  2 0 2 3 2 4 3 0 27 0 ...

EngrExpt documentation built on May 2, 2019, 5:53 p.m.