# Question: Statistical monitoring of a quality characteristic uses both an x

Statistical monitoring of a quality characteristic uses both an x and s chart. The charts are to be based on the standard values m = 200 and sx = 10, with n = 4.

(a) Find three-sigma control limits for the s chart.

(b) Find a center line and control limits for the x chart such that the probability of a type I error is 0.05.

(a) Find three-sigma control limits for the s chart.

(b) Find a center line and control limits for the x chart such that the probability of a type I error is 0.05.

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