文档介绍：Description of Measurement Data Chapter 2 Content Frequency distribution Descriptions of central tendency Measures of dispersion Normal distribution Range of reference value Section 1 Frequency Distribution 1、Frequency table : Example 2-1 To acquire the values of total cholesterol in serum of 101 healthy female adults as below,and to work out the frequency table. Approach: (1). Range : The difference between the maximum and the minimum, R. 。 (2).Class Interval (i) : Usually divided into 10-15 groups (3).Group: Lower limit(L):the beginning of every group Upper limit(U):the end of every group Group ~ ~ ~ ~ … ~ ~ ~ (4).Grouping and Counting Frequencies ~ ~ 2、Graph of frequency distribution