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Ch 7-Foundations of Hypothesis Testing.docx

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Department
Psychology
Course
PSYC 1010
Professor
Anne Bergen
Semester
Fall

Description
Ch7FoundationsofHypothesisTestingProbabilitiesProportionsandZScores10172013NeedtoKnowHowtocalculateascorefromrawscoresandsamplemeanszHowtotransformscoresbackintorawscoresandsamplemeanszHowtofindapercen8lefromascorezAreasUndertheNormalCurveRecallthatthatwecanfindareasunderthecurveforanynormaldistributionofscoresakathezstandardnormaldistributionTheseareasproportionscanbeusedtofindtheprobabilityofscoringaboveorbelowagivencutoffpointiescoreorsamplemeanZscoresandtheNormalCurveBytransformingrawscoresvaluesandsamplemeanstozscoreswecanfindprobabilitiesXMassociatedwiththosescoresmeansWecananswerquestionslikeWhatpercentageofpeoplescoredhigherthanXIssamplemeanlikelyorunlikelytooccurMZTableTextbooktableB1willbegiveninclassdontmemorizeZztableProvidesAreasUnderCurvefordistributionUsingtheztableyoucanfindtheareaunderthecurvethatcorrespondstogivenzscoresTheareaunderthecurveisproportionaltothefrequencyofthescoresTheareaunderthecurvebetweentwocutoffpointsgivestheprobabilityofobtainingascorebetweenzthoseboundariesZZscoresandthetableThesetoolscananswerawidevarietyofquestionsaboutanynormaldistributionwithaknownmeanstandarddeviationUsuallywewillsolvetwomaintypesofnormaldistributionproblemsaFindingaproportiongivenascoreormean
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