求助：请问两组独立样本t test，方差不齐使用welch校正，结果为什么三个p都大于0.05

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如图：a2和b2都符合正态（sktest和swilk检验都>0.05），方差不齐，代码为 ttest a2==b2, unpaired unequal welch



. ttest a2==b2, unpaired unequal welch
Two-sample t test with unequal variances
------------------------------------------------------------------------------
Variable |     Obs        Mean    Std. Err.   Std. Dev.   [95% Conf. Interval]
---------+--------------------------------------------------------------------
      a2 |      16    .0567185    .0034406    .0137622    .0493851    .0640519
      b2 |      16    .0537502    .0078743    .0314973    .0369665    .0705339
---------+--------------------------------------------------------------------
combined |      32    .0552344    .0042351    .0239574    .0465968    .0638719
---------+--------------------------------------------------------------------
    diff |            .0029683    .0085932               -.0148887    .0208253
------------------------------------------------------------------------------
    diff = mean(a2) - mean(b2)                                    t =   0.3454
Ho: diff = 0                             Welch's degrees of freedom =  21.2627
    Ha: diff < 0                 Ha: diff != 0                 Ha: diff > 0
Pr(T < t) = 0.6334         Pr(|T| > |t|) = 0.7332          Pr(T > t) = 0.3666
.


数据如下：a2
.0520833
.0606061
.0578035
.0714286
.0694444
.0352113
.0361011
.0621118
.0574713
.0609756
.0529101
.0826446
.0694444
.0425532
.0361011
.0606061


b2
.0191939
.0182815
.025641
.0337838
.0444444
.0625
.030303
.0628931

.031746
.018018
.0806452
.1020408
.0869565
.0512821
.1176471
.0746269


谢谢各位！！

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关键词：Welch Welc 方差不齐 test Wel stata t test 方差