资源描述:
《统计学上机作业.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、统计学上机作业(1)一、利用软件计算1、宾馆未露面者人数进行统计频数分析,分析结果对确定超员预定客房数有何帮助?(数据参见课件)因而得出结论该宾馆可以增加订房数,以使得宾馆的到充分运用。2、文件名:DATA11-02文件说明:1973年某市测量120名12岁男孩身高资料。变量说明:height:12岁男孩身高绘制身高分布的直方图,求出该市12岁男孩身高平均值95%和99%的置信区间,说明置信系数与区间宽度之间的关系。(1)当平均值是95%时:(1)当平均值是99%时有置信区间的:当置信度为95%时,为(141.996,144.100),当置信度为99%时,为(141.657,14
2、4.439)说明置信度越大估计精度越差。3、文件名:DATA09-03文件说明:1969-1971年美国一家银行的474名雇员情况的调查数据,其中包括工资、受教育水平、工作经验、种族等数据。变量说明:ID:EmployeeCode(雇员代码)GENDER:性别BDATE:DateofBirth(出生日期)EDUC:EducationalLevel(years)(受教育年份)JOBCAT:EmploymentCategory(工作地位)SALARY:CurrentSalary(当前工资)SALBEGIN:BeginningSalary(起始工资)JOBTIME:Monthssinc
3、eHire(雇佣月份)PREVEXP:PreviousExperience(months)(以前工作经历)MINORITY:MinorityClassification(特殊群体)AGE:年龄A、请分别求出该银行中男雇员、女雇员工资平均值的95%的置信区间。CaseProcessingSummaryCasesValidMissingTotalGenderNPercentNPercentNPercentCurrentSalaryFemale216100.0%0.0%216100.0%Male258100.0%0.0%258100.0%DescriptivesGenderStatis
4、ticStd.ErrorCurrentSalaryFemaleMean$26,031.92$514.2695%ConfidenceIntervalLowerBound$25,018.29forMeanUpperBound$27,045.555%TrimmedMean$25,248.30Median$24,300.00Variance.268Std.Deviation$7,558.02Minimum$15,750Maximum$58,125Range$42,375InterquartileRange$7,012.50Skewness1.863.166Kurtosis4.641.33
5、0MaleMean$41,441.78$1,213.9795%ConfidenceIntervalforMeanLowerBound$39,051.19UpperBound$43,832.375%TrimmedMean$39,445.87Median$32,850.00Variance.303Std.Deviation$19,499.21Minimum$19,650Maximum$135,000Range$115,350InterquartileRange$22,675.00Skewness1.639.152Kurtosis2.780.302所以得女职工工资均值的置信度为95%的
6、置信区间为:(25,018.29,27,045.55)男职工工资均值的置信度为95%的置信区间为:(39,051.19,43,832.37)B、请计算出男女平均工资差异的95%的置信区间,并对差异程度做出解释。GroupStatisticsGenderNMeanStd.DeviationStd.ErrorMeanCurrentSalaryMale258$41,441.78$19,499.21$1,213.97Female216$26,031.92$7,558.02$514.26IndependentSamplesTestLevene'sTestforEqualityofVaria
7、ncest-testforEqualityofMeansFSig.tdfSig.(2-tailed)MeanDifferenceStd.ErrorDifference95%ConfidenceIntervaloftheDifferenceLowerUpperCurrentSalaryEqualvariancesassumed119.669.00010.945472.000$15,409.86$1,407.91$12,643.32$18,176.40Equalvariancesno