Personal computer manufacturer data

A personal computer manufacturer counts the number of nonconformities per unit on the final assembly line. He collects data on 20 samples of 5 computers each.

data(pcmanufact)

Format

A data frame with 10 observations on the following 2 variables.

x

number of nonconformities (inspection units)

size

number of computers inspected

References

Montgomery, D.C. (1991) Introduction to Statistical Quality Control, 2nd ed, New York, John Wiley & Sons, pp. 181--182

Examples

data(pcmanufact)
describe(pcmanufact)
#>      Obs Mean StdDev Min Median Max
#> x     20 9.65  3.133   5     10  16
#> size  20 5.00  0.000   5      5   5
pcmanufact <- transform(pcmanufact, sample = seq(nrow(pcmanufact)))
plot(x/size ~ sample, data = pcmanufact, type="b")