1.) Now determine the three-sigma control limits for the R-chart. Begin with the upper limit.

2.) Next, determine the lower limit.

3.) To interpret the results, plot the R-chart for the data with the obtained control limits and center line

4.) Determine the values of the constant A2

5.) Now determine the control limits for the x-chart. Begin with the upper limit.

6.) Next, determine the lower limit.

The Digital Guardian Company issues policies that protect clients from downtime costs due to computer system failures. It is very important to process the policies quickly because long cycle times not only put the client at risk, they could also lose business for Digital Guardian. Management is concerned that customer service is degrading because of long cycle times, measured in days. The table contains the data from five samples, each sample consisting of eight random observations. Click the icon to view the table with sample data. Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. a. What is your estimate of the process average? The estimate of the process average is . (Enter your response rounded to two decimal places.) b. What is your estimate of the average range? The estimate of the average range is (Enter your response rounded to two decimal places.) c. Construct an R- and an x-chart for this process. Set up the R-chart by specifying the three-sigma control limits below. The UCLR equals and the LCLR equals (Enter your responses rounded to two decimal places.) More Info More Info