Suppose Appendix Table A.3 contained (z) only for z 0. Explain how you could still compute a. P( 1.72 Z .55) b. P( 1.72 Z .55) Is it necessary to table (z) for z negative? What property of the standard normal curve justifies your answer?

Chapter1 WhatisStatistics Itisadisciplineandawaytocollectdata/information § Datacanbenumbers(weight,income,height)oritcouldbewords(gender,race,favoritecolor) Variability :Theextenttowhichdatapointsinastatisticaldistributiondivergefromtheaverage Value Symbol Pronunciation Range:ThedistancebetweentheHighestdatapoint PopulationMean (parameter) andthelowestdatapoint Population:Thesetofallindividualpointsweareint