The errors of the mean and standard deviation of the time of activity and project completion caused by assumptions are given by means of deviation tests.

利用检验的办法确定了PERT假设前提对工序时间的均值、标准离差及总工期所产生的误差。

youdao

As participants in any given activity improve across the board, says Mauboussin, the standard deviation shrinks.

FORBES: Ted Williams And The Efficient Market Theory: Why All Stars Seem To Be Getting Worse