I am performing a capability study using Minitab. The dimension is a True Position with a specification of 1.5. If I list 0.0 in the lower spec limit and 1.5 in the upper spec limit, I get a 1.31 Cpk. If I leave the lower spec limit blank, I get a Cpk of 3.40.
My data consists of 50 measurements. The results are the same if I consider the 50 as a subgroup of 1 or 5. My Max is .63, my mean is .42, my min is .21
Which result would be correct; 0.0 in the LSL or leave it blank?
My data consists of 50 measurements. The results are the same if I consider the 50 as a subgroup of 1 or 5. My Max is .63, my mean is .42, my min is .21
Which result would be correct; 0.0 in the LSL or leave it blank?