Show I I HOW HOV NOT TO USE STATISTICS Imagine a t foot LOOt race in which a largo argo number of persons arc are ong engaged ged In the front ranks will be bo found fount persons of superior qualifications in the tho rear willbe will willbe willbo be bo persona with many weaknesses while in the mi ranks of f the runners run runS tiers ners will bo bu many litany in ha having one or two defects of one sort sori or another sufficient to hold them where they arc Ono One has hns poor moor loor lungs luus otto a weak heart one ono is of sluggish i vigor or one suffers from a strained muscle muscles and BO so on In cack caso case a good might by br a careful diagnosis show where tho weakness lies Hes Now ow suppose a statistician should wish to show the tho effect of let us say a weak heart on runn running ns ability lie selects a representative group roup from tho the middle third of tho thu runners aud and carefully care care- I fully ull tabulates each cach case caso of weak heart To his lIis surprise he lie finds that the men with tho the weak welk hearts are arc doing quite as aswell aswell well selI as the tho others running near them who vito have c strong hearts To be bo sure the other men mou have ha poor lungs defective defect defect- ive ire muscles or other W weaknesses but these arc not objects of study and so 80 are arc not note noted Tho The ono one fact stands out that in the tho representative group studied the men with weak hearts run a as well as tho those e with good hearts The rhe correlation corro corre lation is computed and the conclusion established that a weak heart is no 0 in a foot race C. C. C It TI Davis Da Da- sis vis in iii The Tho Survey |