ex04.80 {Devore5}R Documentation

data from exercise 4.80

Description

The ex04.80 data frame has 10 rows and 1 columns of bearing lifetimes.

Format

This data frame contains the following columns: describe{ item{lifetime}{ a numeric vector } }

Source

Devore, J. L. (2000) Probability and Statistics for Engineering and the Sciences (5th ed), Duxbury

(1985), "Modified Moment Estimation for the three-parameter Log-normal distribution", Journal of Quality Technology, 92㫻.

Examples

library(Devore5)
data(ex04.80)
attach(ex04.80)
boxplot(lifetime, ylab = "Lifetime (hr)",
        main = "Bearing lifetimes from exercise 4.80",
        col = "lightgray")
## Normal probability plot on the original time scale
qqnorm(lifetime, ylab = "Lifetime (hr)", las = 1)
qqline(lifetime)
## Try normal probability plot of the log(lifetime)
qqnorm(log(lifetime), ylab = "log(lifetime) (log(hr))",
       las = 1)
qqline(log(lifetime))
detach()


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