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时间:2020-08-27
《SPSS区间估计实训指导.doc》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、山东英才学院实训报告小组成员:班级:实训地点:实训时间:指导老师:尹晓宇实训项目:Spss区间估计实训内容:区间估计1、单个正态总体的均值的点估计与区间估计2、两个正态总体的均值、方差点估计与区间估计实训步骤与结果:3.1解:操作步骤:Analyze→DescriptiveStatistics→Explore,将x选入DependentList,在Statistics中选中Descriptives输出结果表3-1DescriptivesStatisticStd.ErrorxMean180.050011.6833195%ConfidenceIntervalforMeanLowe
2、rBound156.8678UpperBound203.23225%TrimmedMean172.3556Median156.0000Variance13649.967Std.Deviation116.83307Minimum24.00Maximum510.00Range486.00InterquartileRange130.25Skewness1.112.241Kurtosis.572.478结果分析:由表3-1可知,该超市每位顾客的平均花费金额的点估计180.0500,可信度为95%的区间估计为(156.8678,203.2322)(保留两位小数)。3.2解:(1)先估计
3、每位顾客平时的平均花费金额和周末的平均花费金额的置信区间操作步骤:Analyze→DescriptiveStatistics→Explore,将x选入DependentList,将顾客总体选入FactorList,在Statistics中选中Descriptives;输出结果:表3-2-1Descriptives顾客总体StatisticStd.Errorx总体一Mean159.800017.5234095%ConfidenceIntervalforMeanLowerBound124.5854UpperBound195.01465%TrimmedMean150.3778Med
4、ian116.0000Variance15353.469Std.Deviation123.90912Minimum24.00Maximum480.00Range456.00InterquartileRange139.75Skewness1.264.337Kurtosis.713.662总体二Mean200.300015.0918395%ConfidenceIntervalforMeanLowerBound169.9718UpperBound230.62825%TrimmedMean192.8222Median177.5000Variance11388.173Std.Devia
5、tion106.71539Minimum55.00Maximum510.00Range455.00InterquartileRange109.25Skewness1.237.337Kurtosis1.059.662(2)再估计二者的差的置信区间操作步骤:Analyze→Comparemeans→Independent—SamplesTtest,将x选入TestVariable(s),将顾客总体选入GroupingVariable(s),在DefineGroups中分别定义总体一和总体二。输出结果:表3-2-2IndependentSamplesTestLevene'sTest
6、forEqualityofVariancest-testforEqualityofMeansFSig.tdfSig.(2-tailed)MeanDifferenceStd.ErrorDifference95%ConfidenceIntervaloftheDifferenceLowerUpperxEqualvariancesassumed1.312.255-1.75198.083-40.5000023.12645-86.393695.39369Equalvariancesnotassumed-1.75195.892.083-40.5000023.12645-86.406315.
7、40631结果分析:表3-2-1是探索性分析的结果,可知每位顾客平时的平均花费金额的置信区间为(124.5854,195.0146),周末的平均花费金额的置信区间为(169.9718,230.6282)。表3-2-2是独立样本t检验的结果,Levene'sTestforEqualityofVariances为方差检验的结果,F=1.312,其P值为0.255<0.05,拒绝方差相等的原假设,认为两总体的方差不等,因此两总体的差的置信区间为(-86.40631,5.40631)3.3解:操作步骤:Anal
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