简介:<正>WhenreportingtheprevalenceofchildhoodobesityintheUSAafewyearsago,themagazineU.S.News&WorldReportstated:"...some17percentofkidsarenowobese,whichmeansthey’reatorabovethe95thpercentileforweightinrelationtoheightfortheirage;anadditional17percentareoverweight,oratoroverthe85thpercentile."Anyonewithsomebasictraininginmeasurementorstatisticswillrealizethatthisstatementisincorrect.Thisisbecausethepercentileisdefinedasthevaluebelowwhichacertainpercentofobservationsfallinapopulation.Forexample,the15th