# Question

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.

(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?

(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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