如何检验一批数据是一个正态总体的样本呢?一种简单而有效的方法是利用正态概率纸。这种纸的横坐标是普通的刻度,纵坐标按正态分布的规津刻划。图7是把表1(见本刊上期47页左栏)所列的100个数据在正态概率纸上点出的情况。观测值0.08这一组的累计相对频数是0.10,相应的点是(0.08,10),余类推。所有的点几乎在同一条直线上,所以可以认为 How to test a group of data is a normal population of the sample? A simple and effective way is to use normal probability paper. The abscissa of this paper is an ordinary scale, the vertical axis of the ordinate according to the rules of normal distribution. Figure 7 shows a case where 100 data listed in Table 1 (see the left column of page 47 of this issue) is plotted on normal probability paper. The observed relative frequency of 0.08 in this group is 0.10, the corresponding point is (0.08,10), and so on. All the points are almost on the same line, so I can think of it