Question: 1. Given that a process is found to have a historical mean of 66 and a historical standard deviation of 2.5 find the control limits

1. Given that a process is found to have a historical mean of 66 and a historical standard deviation of 2.5 find the control limits for an Xbar-chart being used with samples of size 10.

b. Using the same process as in question 1 with the assumption that it is in control and the desired range is between 58 and 75, compute the capability index using a +/-3 standard. Is the process capable?

c. Given that a process is found to have a historical mean of 37.2 and a historical range of 5.2 find the control limits for an Xbar-chart and R-chart used with samples of size 10.

Hint: You may want to review p 332.

d. Given that a process is found to have a historical mean count of 13 errors per sample find the control limits for a c-chart.

e. Given that a process is found to have a historical percent defective of 5% find the control limits for a p-chart with samples of size 36.

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