Question: Samples of size n = 4 are selected from a production line. a. What is the value of the A2 factor used to determine the

Samples of size n = 4 are selected from a production line.
a. What is the value of the A2 factor used to determine the upper and lower control limits for the mean?
b. What are the values of the D3 and D4 factors used to determine the lower and upper control limits for the range?

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