欢迎来到天天文库
浏览记录
ID:5652233
大小:30.50 KB
页数:3页
时间:2017-12-21
《假设检验上机作业》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、假设检验上机1.已知某炼铁厂的铁水含碳量在正常情况下服从正态分布,现在测了5炉铁水,其含碳量分别为4.284.404.424.354.37,如果总体方差不变,求总体均值有无变化。2.已知某钢生产的钢筋强度服从正态分布,长期以来,其抗拉强度均值为52.00kg/每平方毫米,今改变炼钢的配方,利用新方法炼制了7炉钢,从这7炉钢生产的钢筋中每炉抽一根测得其强度分别为:52.4548.5156.0251.5349.0253.3854.04问:新方法炼钢生产的钢筋其强度均值有否显著提高。3.在漂白工艺中要观察温度对针织品断裂强度的影响,在70
2、度与80度下分别做了7次和9次测试,测得断裂强度的数据为:70度:20.518.820.921.519.521.621.880度:17.719.220.320.018.619.019.120.018.1试问两种温度下的平均断裂强度有无显著差别。4.sas教材241页第二题5.sas教材241页第一题dataa;inputweight@@;cards;4.284.404.424.354.37;procttestdata=ah0=4.55;varweight;run;运行结果;TheSASSystem14:28Tuesday,March
3、27,20121ProcedureTheTTESTStatisticsLowerCLUpperCLLowerCLUpperCLVariableNMeanMeanMeanStdDevStdDevStdDevStdErrMinimumMaximumweight54.29684.3644.43120.03240.05410.15550.02424.284.42T-TestsVariableDFtValuePr>
4、t
5、weight4-7.680.0015datab;inputquality@@;cards;52.4548.5156.0251
6、.5349.0253.3854.04;procttestdata=bh0=52.00;varquality;run;运行结果;LowerCLUpperCLLowerCLUpperCLVariableNMeanMeanMeanStdDevStdDevStdDevStdErrMinimumMaximumquality749.64352.13654.6281.73672.69515.93481.018748.5156.02T-TestsVariableDFtValuePr>
7、t
8、quality60.130.8984datac;inputf
9、irstsecond@@;cards;20.517.718.819.220.920.321.520.019.518.621.619.021.819.1.20.0.18.1;procttestdata=c;varfirstsecond;run;运行结果;TheTTESTProcedureStatisticsLowerCLUpperCLLowerCLUpperCLVariableNMeanMeanMeanStdDevStdDevStdDevStdErrMinimumMaximumfirst719.60420.65721.710.7336
10、1.13852.50710.430318.821.8second918.4319.11119.7930.59890.88661.69860.295517.720.3T-TestsVariableDFtValuePr>
11、t
12、first648.00<.0001second864.66<.0001
此文档下载收益归作者所有