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Bob a manufacturing plant manager is inspecting the

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Bob, a manufacturing plant manager, is inspecting the diameters of ball bearings produced by a suspected malfunctioning unit. He randomly selects a sample of 12 ball bearings and measures the diameters, which are as follows (in millimeters):

Sample 1   152    141   148

Sample 2   150    146   156

Sample 3   155    149   153

Sample 4   156    147   151

a) Construct a Mean Chart. Assume sample sizes of 3. Include the UCL and LCL. Is the process in control?

b) Construct a Range Chart.Assume sample sizes of 3. Include the UCL and LCL. Is the process in control?

Reference no: EM13638370

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