Boston Silicon Chip Manufacturing records data on average chip weight every 25 b

Question

Boston Silicon Chip Manufacturing records data on average chip weight every 25 business days. The Quality Assurance Technician is on vacation. You have been hires to assist in the interpretation of the silicon chip weight distributions. The average weight of a silicon chip is .50 mm or approximately 1.9685 inches. We will use the following data: Mean =1.9865 Range of .25, All other Excel data should remain unchanged 1. What is the (x-bar) value? 2. What is the upper control limit? 3. What is the lower control limit? 4. What is the R-bar value? What does this reveal about the process variability? 5. Identify the proper conclusion regarding the data? While the process mean dispersion a. remained constant, has shifted b. has shifted, remained constant the

Explanation / Answer

x bar is basically mean so value is 1.9865

Part 2 and 3 Sigma value needs to be fixed e.g. do you want process at 3 sigma or 4 sigma

Then UCL = x bar + nSigma

And LCL = x bar - nSigma

4 R bar is mean of ranges of all readings

I could not find excel sheet or data to give the full answer

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