Reconsider the data from Exercise 6.42 and establish x and R charts with appropriate trial control limits.

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Reconsider the data from Exercise 6.42 and establish x and R charts with appropriate trial control limits. Revise these trial limits as necessary to produce a set of control charts for monitoring future production. Suppose that the new data in Table 6E.19 are observed.
Reconsider the data from Exercise 6.42 and establish x and

(a) Plot these new observations on the control chart. What conclusions can you draw about process stability?
(b) Use all 25 observations to revise the control limits for the x and R charts. What conclusions can you draw now about the process?

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