In this assignment you will create control charts for the following data for each country code.
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1. Compute the average cycle time for each country code.
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2. Compute the moving range for each country code.
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3. Compute the confidence interval for each using the average cycle time plus or minus the product of 2.66 times the average moving range for each country code.
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4. Turn in the spreadsheet with calculations.
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5. Does the OTR time appear to be stable? Why or why not?
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6. If you were to use a control chart to evaluate stability, which chart would you use? Why?
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7. What can you learn about the distribution of the installation process?
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8. Does it appear that the country has an impact on installation time? Why or why not?
