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Nickyan · 2023年07月27日

请问能帮我解答下这道题吗,答案有点看不懂

NO.PZ2021061603000008

问题如下:

In a frequency distribution, the absolute frequency measure

选项:

A.represents the percentages of each unique value of the variable B.represents the actual number of observations counted for each unique value of the variable C.allows for comparisons between datasets with different numbers of total observations

解释:

B is correct. In a frequency distribution, the absolute frequency, or simply the raw frequency, is the actual number of observations counted for each unique value of the variable. A is incorrect because the relative frequency, which is calculated as the absolute frequency of each unique value of the variable divided by the total number of observations, presents the absolute frequencies in terms of percentages. C is incorrect because the relative (not absolute) frequency provides a normalized measure of the distribution of the data, allowing comparisons between datasets with different numbers of total observations.

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已采纳答案

星星_品职助教 · 2023年07月27日

同学你好,

本题问absolute frequency的定义。absolute frequency是每个结果所出现的次数,即B选项的描述。

与之相对比,如果将观察值的次数除以总次数,则为relative frequency(A选项的描述)。relative frequency不是一个次数,而是一个百分数,故relative frequency可以用于不同的数据集之间的对比(C选项)。