请问一个2sample t的问题
请问大师：下面的图可以看出什么？Two-Sample T-Test and CI: before, after
Two-sample T for before vs after
N Mean StDev SE Mean
before 15 41.47 7.43 1.9
after 15 36.33 6.16 1.6
Difference = mu (before) - mu (after)
Estimate for difference: 5.13333
95% CI for difference: (0.01830, 10.24836)
T-Test of difference = 0 (vs not =): T-Value = 2.06 P-Value = 0.049 DF = 27
Two-sample T for before vs after
N Mean StDev SE Mean
before 15 41.47 7.43 1.9
after 15 36.33 6.16 1.6
Difference = mu (before) - mu (after)
Estimate for difference: 5.13333
95% CI for difference: (0.01830, 10.24836)
T-Test of difference = 0 (vs not =): T-Value = 2.06 P-Value = 0.049 DF = 27
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zionward (威望:0)
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为了检验两个母集团的均值是否有差异,一般我们都用2-sample T,而Paired T,一般针对对应的样本在不同水准时候的比较(比较的样本是一一对应关系,只是不同水准对比)
(?但是一些疑问? Test的关注点( population 还是 sample)?
2-sample T是为了比较样本所代表的集团的均值差异,那Paired T呢? paired T是更关注样本代表的母集团的差异还是 只是选择的对应的这些样本呢?