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You are the engineer in charge of two plants manufacturing a highly engineered highly precise product which has to measure 4 inches in diameter with a tolerance of plus or minus 0.005 inches. Each plant has 2 production lines. Recently there have been complaints from the customer about the quality of the shipments. You are assigned to study these 4 production lines and come up with INDIVIDUAL improvement plans for each one of them. You collected 200 random samples and the table below has the data. Are the customer complaints valid? Analyze the data and recommend your action plan.