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Summarizing and Visualizing Data
Reading Frequency Tables and Histograms
Description
Frequency distributions organize quantitative data by showing how often each value appears. A frequency is the number of times a data value occurs. When the frequency values are added together, the total equals the number of students in the sample.
These distributions are useful for grouping nume...
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Transcript
假设有一组50名个体参加马拉松比赛。马拉松组织者希望了解参与者人数随年龄的变化情况。
为了查明结果,可使用频数分布表对数据进行汇总。频数分布表是一种统计工具,用于表示将数据划分为若干类别或组别,并列出每一类对应的数值个数(称为频数)。
频数表有助于理解数据集中数据的出现次数和分布情况。
例如,频数表有助于直观展示学生身高的分布情况。
同样,通过频数分布表可以直观地展示一组患者的脉率变化情况。
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