Question: 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 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: Machine Measurements 1 7 4 7 2 5 9 7 3 5 7 6 4 8 5 8 Find the x-bar and R-Chart control limits using these data. Is the process in control? (a) UCLx = 8.69, LCLx = 4.31; UCLR = 6.87, 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 out of control (d) UCLx = 9.57, LCLx = 3.43; UCLR = 7.72, LCLR = 0; process is in control

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