ABSTRACT
Statisticalformulaeusedtoanswerquestionsortesthypothesesinaquantitativestudy
requirethatarepresentativesampleberandomlyselected,mostoftenfromwhatisconsidered
anormalpopulation.Forapopulationtobeconsiderednormal,thedistributionoftheele-
mentsormembersofthepopulationsmustbegroupedaccordingtothenormalprobability
curve,orbell-shapedcurve(seetheappendixattheendofthisbook).
