![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
该研究者想检验性别与信任程度之间是否有相关关系,下表是其统计分析的结果。 ------------------------------------------------------------------------------ Group | Obs Mean Std. Err. Std. Dev. [95% Conf. Interval] ---------+-------------------------------------------------------------------- 男 | 1594 3.887704 .0261538 1.04419 3.836404 3.939003 女 | 1995 3.87619 .024451 1.092148 3.828237 3.924144 ---------+-------------------------------------------------------------------- combined| 3589 3.881304 .017877 1.070981 3.846254 3.916354 ---------+-------------------------------------------------------------------- diff | .0115134 .0359838 -.0590374 .0820642 ------------------------------------------------------------------------------ 由调查活动带来的误差称之为调查总误差,它可以用均方误(MSE)来表示。上述调查研究的均方误为: