两个正态总体的均值检验、配对样本均值检验.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,5.,实战练习,例,1,：配制两种不同,饲,料,A,、,B,养殖罗非鱼，选取,14,个鱼池，随机分,成,两组进行实验。经一定试验期后的鱼量列入下表（有一鱼池遭到意外而缺失数据）。试问这两种不同,饲,料养殖罗非鱼的产鱼量有无差异？,A,料,578,562,619,544,536,564,532,B,料,642,587,631,625,598,592,例,2,：有,A,、,B,两种饮料，分别各安排,10,人对其中一种饮料评价（共,20,人，每人只喝其中一种饮料），结果如下：,两种饮料口味是否有差异？,A,1,3,2,2,3,4,5,1,2,3,B,4,5,5,4,4,2,1,4,3,3,例,3,：,10,只家兔,打了,某种疫苗前后体温变化如下表，试检验前后体温是否有显著的变化？,兔号,1,2,3,4,5,6,7,8,9,10,前,38.0,38.2,38.2,38.4,38.4,38.1,38.1,38.2,38.5,38.3,后,38.4,38.5,38.5,38.8,38.9,38.5,38.7,38.5,38.5,39.0,配对样本,均值检验,原假设：,H,0,：,u,1,-u,2,=0,，其中,u1,为第一个总体均值，,u2,为第二个总体均值。,适用范围差值服从正态分布,例：,10,只家兔,打了,某种疫苗前后体温变化如下表，试检验前后体温是否有显著的变化？,兔号,1,2,3,4,5,6,7,8,9,10,前,38.0,38.2,38.2,38.4,38.4,38.1,38.1,38.2,38.5,38.3,后,38.4,38.5,38.5,38.8,38.9,38.5,38.7,38.5,38.5,39.0,Spss,的操作步骤：,1,）输入数据，计算差值,Z,3),AnalyzeCompare MeansPaired-samples T Test,Transformcompute,2)Z,的正态性检验,Analyzedescriptive statisticexplore,plots-,选择,normally plots with tests,按,ok,即可,4,）显示结果,Sig0.05,说明前后体温有显著性差异，结合样本均值，打了疫苗后体温变高了。,例,4,某学校推广了一种新的教学方法，实施前和实施后用一套平行试卷分别测试了学生的学业成绩，结果如下，试问，这种教学方法是否有效？,前,68,71,58,92,74,84,52,78,79,96,59,83,后,69,70,56,95,77,81,52,75,76,98,61,76,例,5,用某药治疗,10,名高血压病人，対一病人,治疗前、后的舒张压（,mmHg,）进行了测量，,问该药有无降压作用？,