The process under statistical control

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Reference no: EM131111086

In their text, Quantitative Analysis of Management (1997), B. Render (Rollins College) and R. M. Stair (Florida State University), present the case of the Bayfield Mud Company. Bayfield supplies boxcars of 50-pound bags of mud treating agents to the Wet-Land Drilling Company. Mud treating agents are used to control the pH and other chemical properties of the cone during oil drilling operations. Wet-Land has complained to Bayfield that its most recent shipment of bag3 were underweight by about 5%. (The use of underweight hags may result in poor chemical control during drilling, which may hurt drilling efficiency resulting in serious economic consequences.) Afraid of losing a long-time customer, Bayfield immediately began investigating their production process. Management suspected that the causes of the problem were the recently added third shift and the fact that all three shifts were under pressure to increase output to meet increasing demand for the product. Their quality control staff began randomly sampling and weighing six bags of output each hour. The average weight of each sample over the last three days is recorded in the table along with the weight of the heaviest and lightest bag in each sample

a. Construct an -chart for these data

b. Is the process under statistical control?

c. Does it appear that management's suspicion about the third shift is correct? Explain?

Reference no: EM131111086

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