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四.正态分布正态分布是概率分布的一种,而且是常见的一种。当抽取样本相当大时,便能测得概率分布的情况。如正常人的身高、体重、脉率、肺活量、血清总蛋白含量等生理指标,均以这种曲线反映波动的规律。以正常人的身高为例,中等身材的人居多数,特别高大和特别矮小的人总是极少数。所以如果我们根据频数分布情况由低向高划一曲线。便如图1-1所示。
Normal Distribution Normal distribution is a kind of probability distribution, and it is a common one. When the sampling is quite large, the probability distribution can be measured. Such physiological parameters as height, weight, pulse rate, vital capacity, and serum total protein content of normal people are reflected by this curve. Taking the height of a normal person as an example, the majority of people of medium stature are inhabited, and there are always very few people who are particularly tall and particularly short. So if we follow the frequency distribution, we can draw a curve from low to high. As shown in Figure 1-1.