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8 have been gathered with the following results A services process is monitored using x-bar and R charts. Eight samples of n5 observations Sample 2 4 Mean 7.2 7.4 6.6 6.8 7.9 6.0 7.2 6.2 Range .43 .52 .53 20 .36 .42 .35 .42 7 8 Using this data, compute the centerline, the 3 sd upper control limit, and the lower control limits for the x-bar and R charts X-bar R-bar UCL r-bar LCL r-bar UCL x-bar LCL x-bar a. Prepare an X-bar chart. Is the process in control? Are you confident in the results? Why? Confident in results In control Yes/No b. Yes No

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