To one and all I move that any further mention - discussion - or dissertation on various statistical terms be hereby banned until a unanimous decision is arrived at to discuss or mention. The various explanations have reinforced each other beautifully. If you all don't know what the difference is between the various terms - you haven't been reading closely. I know they are confusing - it took me the first 2 months of the Statistics course to get them to sink into my thick skull ( fall semester of 1939 - I was madly in love with the gal I eventually married ) Bob Anibal