Problem 1: R Chart and X-bar Chart

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Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. Results from the last five samples are shown in the table. Draw and R Chart and an x-bar chart. Based on the charts, is the process under control? (See attachment for chart)
  • 13 years ago
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    controlchartsolution.doc
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    controlchartsolution.xls

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    x-bar_and_r-chart.xlsx
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