EngrExpt (version 0.1-6)

bacteria: Bacteria count in water samples

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.

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")