《行为科学统计精要,8e》 PPT gwE8Ch10.pptxVIP

Chapter10

ThetTestforTwo

IndependentSamples

PowerPointLectureSlides

EssentialsofStatisticsforthe

BehavioralSciences

EighthEdition

byFrederickJGravetterandLarryB.Wallnau

1

乙

●Testdifferencebetweentwopopulationsortwotreatmentsusingindependent-measureststatistic

3

·Evaluatemagnitudeoftheobservedmeandifference

(effectsize)usingCohensd,r²,and/oraconfidenceinterval

10Chapter10LearningOutcomes

Chapter

·Understandstructureofresearchstudyappropriateforindependent-measuresthypothesistest

4

10ToolsYouWillNeed

Chapter

·Samplevariance(Chapter4)

·Standarderrorformulas(Chapter7)

·Thetstatistic(chapter9)

-Distributionoftvalues

-dfforthetstatistic

—Estimatedstandarderror

·Mostresearchstudiescomparetwo(ormore)setsofdata

-Datafromtwocompletelydifferent,independentparticipantgroups(anindependent-measuresorbetween-subjectsdesign)

-Datafromthesameorrelatedparticipantgroup(s)(awithin-subjectsorrepeated-measuresdesign)

10.1Independent-Measures

DesignIntroduction

10.1Independent-Measures

DesignIntroduction(continued)

·Computationalproceduresareconsiderablydifferentforthetwodesigns

·Eachdesignhasdifferentstrengthsandweaknesses

·Consequently,onlybetween-subjectsdesignsareconsideredinthischapter;repeated-

measuresdesignswillbereservedfordiscussioninChapter11

Chapter

Figure10.1Independent-

MeasuresResearchDesign

Unknown

μ=?

SampleA

Unknown

μ=?

SampleB

PopulationAPopulationB

TaughtbymethodATaughtbymethodB

10

Chapter

·Nullhypothesisforindependent-measures

test

H。:μ₁-μ₂=0

·Alternativehypothesisfortheindependent-

es:s-t≠0

₂

s

μ

te

₁

e

₁

a

10.2Independent-Measures

DesigntStatistic

10

●Basicstructure