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一、差异量数我们在研究某一对象时,有时除要知道数据的集中程度外,还往往需要了解数据的分散程度.只有这样,才能比较清楚地了解一组数据的全貌.研究差异虽数,可使我们了解学生的成绩整齐不整齐或平衡不平衡.如果差异量数很小,说明成绩很整齐,集中量数(平均数、中位数、众数)的代表性大;反之,差异员数很大,就说明学生成绩不整齐,集中量数的代表性较小.
First, the difference between the amount of We are in the study of an object, sometimes in addition to want to know the concentration of data, but also often need to understand the degree of dispersion of data, the only way to more clearly understand the whole picture of a group of data. , We can understand that the students' scores are in good order or unevenly balanced, and if the number of discrepancies is small, the results are very neat and the representativeness of the concentration (average, median and mode) is large. On the contrary, the difference A large number of students shows that the results of irregular, less representative of the concentration of small.