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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?

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Statistics and Probability, Statistics

Category:- Statistics and Probability
Reference No.:- M91015947

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