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1、COMPLETEBUSINESSSTATISTICSbyAMIRD.ACZEL&JAYAVELSOUNDERPANDIAN6thedition.Chapter6ConfidenceIntervalsUsingStatisticsConfidenceIntervalforthePopulationMeanWhenthePopulationStandardDeviationisKnownConfidenceIntervalsfor?When?isUnknown-ThetDistributionLarge-Sa
2、mpleConfidenceIntervalsforthePopulationProportionpConfidenceIntervalsforthePopulationVarianceSampleSizeDeterminationTheTemplatesConfidenceIntervals6ExplainconfidenceintervalsComputeconfidenceintervalsforpopulationmeansComputeconfidenceintervalsforpopulation
3、proportionsComputeconfidenceintervalsforpopulationvariancesComputeminimumsamplesizesneededforanestimationComputeconfidenceintervalsforspecialtypesofsamplingmethodsUsetemplatesforallconfidenceintervalandsamplesizecomputationsLEARNINGOBJECTIVES6Afterstudyingt
4、hischapteryoushouldbeableto:Considerthefollowingstatements:x=550Asingle-valuedestimatethatconveyslittleinformationabouttheactualvalueofthepopulationmean.Weare99%confidentthat?isintheinterval[449,551]Anintervalestimatewhichlocatesthepopulationmeanwithinanarr
5、owinterval,withahighlevelofconfidence.Weare90%confidentthat?isintheinterval[400,700]Anintervalestimatewhichlocatesthepopulationmeanwithinabroaderinterval,withalowerlevelofconfidence.6-1UsingStatisticsPointEstimateAsingle-valuedestimate.Asingleelementchosenf
6、romasamplingdistribution.Conveyslittleinformationabouttheactualvalueofthepopulationparameter,abouttheaccuracyoftheestimate.ConfidenceIntervalorIntervalEstimateAnintervalorrangeofvaluesbelievedtoincludetheunknownpopulationparameter.Associatedwiththeintervali
7、sameasureoftheconfidencewehavethattheintervaldoesindeedcontaintheparameterofinterest.TypesofEstimatorsAconfidenceintervalorintervalestimateisarangeorintervalofnumbersbelievedtoincludeanunknownpopulationparameter.Associatedwiththeintervalisameasureoftheconfi
8、dencewehavethattheintervaldoesindeedcontaintheparameterofinterest.Aconfidenceintervalorintervalestimatehastwocomponents:ArangeorintervalofvaluesAnassociatedlevelofconfidenceConfidenceIntervalorInterval