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

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 5 7 6 I 2 IO 2 9 6 7 5 3 4 7 7 7 Find the x-bar and R-Chart control limits using these data. Is the process in control? (a) UCLJ = 8.69, LCLT = 4.31; UCLR= 6.87, LCLR= 0; process is in control (b) UCL = 8.69, LCL = 4.31; UCLR= 6.87, LCLR 0; process is out of control (c) UCLa = 9.57, LCLa = 3.43; UCLR = 7.72, LCLR= 0; process is out of control (d) UCLI = 9.57, LCL = 3.43; UCLR= 7.72, LCLR= 0; process is in control

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