Show HOW NOT TO USE STATISTICS Imagine a foot race in which a large number of persons are engaged In the front ran ranks Its will be found persons of superior qualifications in tho the rear willbo will willbo bo ho persons with many weaknesses while in the thc middle ranks of the tho runners run run- runners ners will be bo many having hang ha ng ono one or two defects of one sort Bort or another sufficient to hold them where thoy they arc aro One has poor lungs one ouo a weak heart ono one is of sluggish vigor ono one suffers from front a strained muscle and BO so on OD In enek case ease a good goo trainer might by a careful diagnosis show where tho weakness lies I Now ow suppose a statistician should wish to show liow time the effect of let us ug say sal sala a U weak heart on running ability I Tie lie e selects a representative group roup from the tho middle third thiril of the runners and care care- I fulir tabulates each case cae of weak heart b I To his surprise he be finds that the tho men with tho time weak hearts aro doing quite as aswell I well wll as the thc others other running near them theta themI who have ha strong hearts To bo ho sure I the other men have o poor lungs defective defect ive mn muscles cles or other weaknesses but these are not objects of study and 80 so arc not noted Time The one fact stands out that in the representative group roup studied the thc men with wish weak hearts run as LS well as those with good hearts The carre lation is computed and the conclusion established that ft l weak heart is no nod d n a foot race C. G. G R B Da Da- Davis vms vis in The oy Survey |