The control chart on page 4, gives a clear signal that the data has a problem with precision. There are only four or five "plateaus" in the data. This would occur for example, if you were measuring thickness with a ruler calibrated in units of 1/16ths and there was little chance for variation in the data.
Department, Program, or Center
Holmes, Donald and Mergen, A. Erhan, "Data precision - Do you have enough?" (2000). QC Report,Accessed from
RIT – Main Campus