It is easy to see that the variance of any of the variables is high at the beginning of the project and low at the end when completion is in sight.
很容易看到，项目的最开始，所有变量的方差都是高的，并在最后项目快完成时降低了。
It is easy to see that the variance of any of the variables is high at the beginning of the project and low at the end when completion is in sight.
很容易看到，项目的最开始，所有变量的方差都是高的，并在最后项目快完成时降低了。
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