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Midterm

Ch 9 (part 1)-single sample t tests.docx

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Department
Psychology
Course
PSYC 1010
Professor
Anne Bergen
Semester
Winter

Description
Ch9Part1SingleSampletTests11052013NeedtoKnowstepsofhypothesistestinghowtofindaCIforazscoreunderstandandcalculateeffectsizeforaztestHypothesisTestingFlowChartPetTVImaginethatappliedpsychologistsworkingforanewpettelevisionstationhypothesizedthatcatsenjoywatchingcommercialsTheysetupanexperimentwhereby50catsareplacedoneatatimeinanexperimentallabfor60minuteswithatelevisionsshowingcommercialsTheresearchersrecordhowlongeachcatwatchesthecommercialsPetTVAsitturnsoutnobodyhasreallylookedatcatsviewingpreferencesontelevisionbeforeSowedontknowthemeanorstandarddeviationforthispopulationDocatsprefertowatchcommercialsH0CatsdonotpreferwatchingcommercialsiethecatswillnotwatchcommercialsformorethanhalfthetimeH1CatspreferwatchingcommercialsiethecatswillwatchcommercialsformorethanhalfthetimeH030minutesH130minutesUsingSampleSDtoEstimatePopulationSDWedontknowthetruevalueofthepopulationstandarddeviationOurbestestimateofthispopulationparametercomesfromoursamplestatisticieestimatepopulationSDusingsampleSDSampleandPopulationVariabilityWhydividetheSumofSquaredbyn1whencalculatingsamplevariabilityRecallthatanysamplewillbelessvariablethanitsparentpopulationWithoutcorrectionforthisdifferencesamplevarianceandSDwouldgiveusanunderestimateofpopulationvariabilityWhencalculatingsamplevarianceandstandarddeviationusen1insteadofntoadjustforthebiasinsamplevariability
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