Bruce Floyd

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]