Question: 13. (rpt) A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under control with

13. (rpt) A Quality Analyst wants to construct a
13. (rpt) A Quality Analyst wants to construct a control chart for determining whether four machines, all producing the same product, are under control with regard to a particular quality variable. Accordingly, he sampled three units of output from each machine, with the following results: Find the x-bar and R-Chart control limits using these data. Is the process in control? (a) UCLx=9.57,LCLx=3.43;UCLR=7.72,LCLR=0; process is in control (b) UCLx=9.57,LCLx=3.43;UCLR=7.72,LCLR=0; process is out of control (c) UCLx=8.69,LCLx=4.31;UCLR=6.87,LCLR=0; process is in control (d) UCLx=8.69,LCLx=4.31;UCLR=6.87,LCLR=0; process is out of control

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