length (in cm) of the electrical contacts of relays in samples of size five, taken hourly from a running process.
A numeric matrix with five columns representing a sample and twenty rows representing hourly samples.
Kenett, R. and Zacks, S. (1998) Modern Industrial Statistics: The Design and Control of Quality and Reliability. Duxbury Press.
data(CONTACTLEN) library(qcc) qcc(CONTACTLEN, type="xbar")
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