MGMT 511Statistical Process ControlGreen River Chemical Company customers have complained regarding the sulfate content of the company’s product. Every customer allows some sulfate content, but theoretically there should be none. The usual customer specification is 90 parts per million (PPM) sulfate.The quality control department at Green River feels that there is no problem with sulfate content, which has been averaging just over 50 PPM. The production department estimates that a substantial investment would be required to lower the amount of this contaminant. These two departments, after consulting with the marketing department and customers, suggest that a control chart be set up to monitor sulfate content. Five samples will be tested per day and plotted as one point on the chart.1) Create the x bar control chart. Use the data in Table 1 to set up the control limits on your control chart. 2) Graph the data from Table 1 on your control chart. Does the data appear to be in control? 3) Using the control limits you computed from the data in Table 1, graph the data from Table 2. Does the process remains in control for the week of April 6—10? 4) What is your recommendation?TABLE 1 Original Green River Chemical Company dataDate 12345XRMarch2575462453650.826 3565447426252.220 4407058454451.430 5525840524649.618 6574252585953.617 9624942335548.229 10403949594847.020 11645042575052.622 12585352485052.210 13605041415048.419 16524748584049.018 17554056494549.016 18474850504848.63 19505049515150.22 20515051516253.012 23515049505050.02 24454770463648.834 25503548394743.815 26557050305151.240 27493864364746.828 30596240546455.824 31363349485644.423April1506753434050.627 2445246474446.68 3704550474150.629TABLE 2 Data for week of April 6—10Date 12345April64545394538 74648484646 85249505452 95753575253 106366616170
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