The reasons there are two main expressions for population and sample" is that one is biased estimator and the other is not."
“母体”与“样本”之所以有两种表达公式，是因为一个是有偏估计，另一个则不是。
The reasons there are two main expressions for population and sample" is that one is biased estimator and the other is not."
“母体”与“样本”之所以有两种表达公式，是因为一个是有偏估计，另一个则不是。
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