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11 2 Sample t Test(Chinese)


2 Sample t Test
NCC K.Nishijima ’03-Aug-9 1

2 Sample t Test
●Two Sample t Test
?鉴定2个分布的平均值是否有有意差。
?Two Sample t Test在正态分布时使用。

无有意差

有有意差 2

2 Sample t Test
●How to use Minitab

点击2-Sample t

3

2 Sample t Test
●How to use Minitab
选择Samples in different columns、分别输入想要鉴 别的列。

如偏差无有意差的话选择Assume equal variances

点击Graphs。

4

2 Sample t Test
●How to use Minitab

选择Boxplots of data

点击OK。

5

2 Sample t Test
●How to use Minitab

点击OK。 6

2 Sample t Test
●Session summary
Two-sample T for Sample1 vs Sample2 N 20 20 Mean 5.183 4.931 StDev 0.858 0.775 SE Mean 0.19 0.17

Sample1 Sample2

Difference = mu Sample1 - mu Sample2 Estimate for difference: 0.252 95% CI for difference: (-0.272, 0.775) T-Test of difference = 0 (vs not =): T-Value = 0.97 P-Value = 0.337 DF = 38 Both use Pooled StDev = 0.818

P-Value在0.05以上此平均值无有意差。 7

2 Sample t Test
●How to use Minitab ●概要
?Stat → Basic Statistics → 2-Sample t ?选择Samples in different columns、分别输入想要鉴别的列。

?如果偏差无有意差的话选择Assume equal variances。
?点击Graphs 。 ?选择Boxplots of data

?OK → OK

8


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