It would be hoped that the process will make product within 3 SD that will work for the customer. Since you are sampling individuals, there is less concern that averages could cover a wide range in results. Taking enough consecutive samples to determine the mean and SD are important. You would not want to go to the customer with a control ch…[Read more]
Are you setting the +/- 3 SD limits on the average of a subgroup or on the individual samples? How many samples are in the subgroup, if there is one? Will the +3SD and -3SD production function as intended?
Interesting discission. I am writing an artricle of this subject for a food magazine. Would any of you care to be interviewed? Please reply to my email address with telephone number and time you are available. (bfloyd7192 @ aol.com)No one mentioned the spread on the individual sample groups. There was a time when if the range of the sub…[Read more]