These are called population measures because they refer to the whole population of possible outcomes and they measure the probabilities.

这些是用来度量总体的变量,因为他们对应的是总体中所有的结果,度量的是所有事件的概率

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With the goal as the best as the possible was to make Some inferences about learning outcomes, And how will the teachers use the materials to effectively help the students learn.

目标是尽可能,推断出学习成果，老师如何使用材料,来有效地帮助学生学习。

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But they're accountable and we can list all possible values when they're discrete and form a probability weighted average of the outcomes.

但随机变量是离散的话,我们可以把所有的可能值列出来,然后算出加权平均值

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