stata 命令如下：

ttesti 样本量1 均值1 样本标准差1 样本量2 均值2 样本标准差2（回车）.

如以下例子：

ttesti 953 171.7 5.6 9571 170 5.5（回车）

结果如下：

Two-sample t test with equal variances
------------------------------------------------------------------------------
         |     Obs        Mean    Std. Err.   Std. Dev.   [95% Conf. Interval]
---------+--------------------------------------------------------------------
       x |     953       171.7    .1814018         5.6     171.344     172.056
       y |     957         170    .1777898         5.5    169.6511    170.3489
---------+--------------------------------------------------------------------
combined |    1910    170.8482    .1284433    5.613428    170.5963    171.1001
---------+--------------------------------------------------------------------
    diff |                 1.7      .25399                1.201873    2.198127
------------------------------------------------------------------------------
    diff = mean(x) - mean(y)                                      t =   6.6932
Ho: diff = 0                                     degrees of freedom =     1908

    Ha: diff < 0                 Ha: diff != 0                 Ha: diff > 0
 Pr(T < t) = 1.0000         Pr(|T| > |t|) = 0.0000          Pr(T > t) = 0.0000

结论：p=0.000<.05，