Question: Repeated sampling of a certain production process reveals the average of all sample means = 40 cm, the average of all sample ranges = 0.5

Repeated sampling of a certain production process reveals the average of all sample means = 40 cm, the average of all sample ranges = 0.5 cm. These values are based on a constant sample size of n = 6. The control limits for an R chart are:

A. zero to 2.504

B. zero to 1.002

C. 37.996 to 42.004

D. -1.504 to 2.504

E. none of the above

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