Question: A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to

A Quality Analyst wants to construct a control

A Quality Analyst wants to construct a control chart for determining whether three machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled four units of output from each machine, with the following results: Machine Measurements 1 18 16 18 16 2 16 25 18 25 3 23 24 23 22 Find the x-bar and R-Chart control limits using these data. Is the process in control? (a) UCL = 23.16, LCL; = 16.84; UCLR=9.89, LCLR= 0; process is out of control (b) UCL = 23.16, LCL, = 16.84;UCLR=9.89, LCLR=0; process is in control (c) UCL = 24.43, LCL; = 15.57;UCLR= 11.15, LCLR=0; process is out of control (d) UCL = 24.43, LCL;= 15.57;UCLR = 11.15, LCLR = 0; process is in control

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