预览加载中，请您耐心等待几秒...

区间估计与样本数(一)(完整版)实用资料.doc

预览
1/10
2/10
3/10
4/10
5/10
6/10
7/10
8/10
9/10
10/10

亲，该文档总共118页，到这已经超出免费预览范围，如果喜欢就直接下载吧～

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

区间估计与样本数(一)（完整版）实用资料 (可以直接使用，可编辑完整版实用资料，欢迎下载） 區間估計與樣本數(一) 欲比較某一多事故路段加強執法前後違規超速車輛佔通過車輛數之比率，經抽樣調查發現，加強執法前違規之比率16%，加強執法後則降至7%，若兩次抽樣調查之樣本數皆為400，試求： 加強執法前違規超速之比率的99%信賴區間。 加強執法後違規超速之比率的99%信賴區間。 加強執法後下降比率之99%信賴區間。 The95%confidenceintervalestimateofthemeantimetakentoprocessanewinsurancepolicyisdays.Whichoneofthefollowingstatementistrue? Only5%ofallpoliciestakelessthan11daysormorethan12daystoprocess. Only5%ofallpoliciestakebetween11and12daystoprocess. About95outofevery100intervalssimilarlyconstructedfromsamplesofsamesizewillcontainthetruemeanvalue. Theprobabilityis0.95thatliesbetween11and12days. Alloftheabove. Suppose95%confidenceintervalforturnsouttobe(1000,2100).Tomakemoreusefulinferencesfromthedata,itisdesiredtoreducethewidthoftheconfidenceinterval.Whichofthefollowingwillresultinreducedintervalwidth? Increasethesamplesize. Decreasestheconfidencelevel. Increasethesamplesizeanddecreasetheconfidencelevel. Increasetheconfidencelevelanddecreasethesamplesize. Amarketsurveywasconductedtoestimatetheproportionofhome-makerswhocouldrecognizethebrandnameofacleanserbasedontheshapeandcolorofthecontainer.Ofthe1,400home-makers,420wereabletoidentifythebrandname. Usingthe0.99degreeofconfidence,thepopulationproportionlieswithinwhatinterval? Whataretheconfidencelimits? Interpretyourfindings. Asurveyof1,000randomlysampledcitizensfoundthat650ofthesecitizenswouldsupportatrafficpolicy.Assumingthatthepopulationisinfinite,whatisthe95%confidenceintervalforthepercentageofsupportforthepolicy?(以數字寫出計算公式即可，不必算到最後的答案) NSYSUBookstoredecidedtosamplethedollaramountofindividualmorningandeveningpurchases.Themanagerbelievesthatthisinformationwouldhelpherorhimdevelopanewmarketingstrategy.Thedataisgiveninthetablebelow: Morning Evening Finda95%confidenceintervalestimateforthedifferencebetweentheaveragepurchaseamountsforthetwotimesofday. Inarandomsampleof100observations,.The95.44%confidenceintervalforis (A)0.122to0.278 (B)0.164to0.236 (C)0.134to0.266 (D)0.120to0.280 Arandomsampleof10