Question: A services process is monitored using x and R charts. Eight samples of n = 10 observations have been gathered with the following results. a)

A services process is monitored using x and R charts. Eight samples of n = 10 observations have been gathered with the following results.

A services process is monitored using x and R

a) Compute the mean (X double bar) for X bar chart

b) Compute the UCL for X bar chart

c) Compute the LCL for X bar chart

d) Is the process in control?

Sample Mean Range .43 1 2 3 4 5 6 4.2 4.4 3.6 3.8 4.9 3.0 4.2 3.2 .52 .53 .20 .36 .42 .35 .42

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