absorb {EngrExpt}

Oil absorption of silica

Description

Time ordered measurements of oil absorption from silica samples produced during one manufacturing shift.

Format

A data frame with 102 observations on the following variable.

absorb

a numeric vector

Details

As stated in Nelson, Coffin and Copeland (2003, p. 424), "One key quality parameter in the making of silica is the amount of oil that it can absorb since silica is often mixed with rubber and oil in various applications (battery separators, tires, shoe soles, etc.)"

References

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

Examples

str(absorb)
summary(absorb$absorb)
densityplot(~ absorb, absorb,
            xlab = "Average oil absorption of silica samples")
qqmath(~ absorb, absorb,
       ylab = "Average oil absorption of silica samples",
       xlab = "Standard normal quantiles", aspect = 1)