text_combined: dave long dlsilcomcom begemans _manufacturing processes_ talks quality control charts tolerance limits part placed outside control limits never inside control chart established data recorded becomes record variation inspected dimension period time data plotted fall random fashion control lines assignable causes variation absent data fall manner assumed part made correctly 9973 time 3 1000 leave process incorrectly made taking look sp 500 using ibbotson 2000 figures 13 expected stock return 20 standard deviation taking actual 25 year return sp since 31 dec 1999 close 30 find 30 2513 3sqrt2520 30 60 still plots control lines long points fall control lines adjustments changes process necessary five seven points fall one side mean process checked points fall outside control lines cause must located corrected immediately maybe shouldve checked process long bull dave httpxentcommailmanlistinfofork tue 06 aug 2002 113010 0700 sp qc