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1、HypothesistestingAveragecouldnotsatisfyourdataanalysis.Becausetheremayexisterror,andmanyreasonwouldresulttheerror.Soweneedhypothesistestingtojudgewhethertheerrorwouldaffecttheresult.Hypothesistestisthemethodthatmakesahypothesisbasedontheprobabilitydistributionordistribu
2、tionparameterofpopulation,accordingtothesampleobservations,makesuseofstatisticalmethodsofanalysistotestthecorrectnessofthishypothesis,anddecidestoacceptorrejectthehypothesis.Hypothesistestalsoiscalledthetestofsignificance.Hypothesistestingisanotherimportantcontentinstat
3、istics.Therearemanymethodsinhypothesistesting,suchast-inspection,F-inspection,-inspectionandsoon.Hypothesistestingcanjudgethedifferentbetweenestimatedvalueandgeneralvaluewithalittlerisk.Itestimatedthetotalbythesample,andtheresultisreliableentirely.Besides,thepurposeofin
4、spectionistoanalyseifevidentcontrastbetweentsampleindexandtotalindex,insteadofdoubtcomputedresultofsampleindexitself.Fromthismeaning,hypothesistestingcanalsonamedsignificancetest.Hypothesistestingisastatisticalinferencemethod,whichisusedtodeterminewhetherthedifferencebe
5、tweensampleandsampleorsampleandpopulationcausedbysamplingerrororessentialdifference.Thebasicprincipleofhypothesistestingistomakecertainhypothesisforthecharacterofpopulation,andthenrejectoracceptthishypothesisthroughinferencesreasoning.Andtherearethreebasicstepsinhypothe
6、sistestingthatare:①setuphypothesisanddeterminethesizeofatest,while,thehypothesiscontainsnullhypothesis(H0)andalternativehypothesis(HA).Themeaningofnullhypothesisisthatthetestsurfacedifferencecausedbythesamplingerror,while,thealternativehypothesisshowsthatthetestsurfaced
7、ifferencealsocontainstestrealdifferencebesidessamplingerror.②selecttestmethodandcalculatestatistics;③determinethePvalueandtheninfertheconclusionaccordingtotheprincipleoflittleprobability.Atthesametime,ifnegativeregion(H0)locatesthetwotailofthesamplingdistributioncurve,a
8、ndtheprobabilityoflefttailandrighttailalsoare,then,thiskindofhypothesistestingiscalledtwo-tailedtest.While,ifn