上两次谈了一些关于概率的常识,现在我们谈一下关于数据和它的特性,以后把它们接榫起来,就可以逐步归入数理统计的正文了。无论做什么事情,都要胸中有“数”,要注意到事物的数量方面。要对事物在数量上有客观的认识,唯一的可靠办法就是通过调查、实践或实验得到数据,然后进行分析研究。在科学实验中,数据是十分宝贵的资料。现在就先谈谈什么是“数据”。大家知道,1、2、3是三个数字,六亿是个数字,圆的圆周与直径之比3.14158也是个数字。从实验或调查得来的实际数字,如在小麦实验中每块小区田亩 We talked about some common sense about probability in the last two times. Now we talk about the data and its characteristics. After connecting them together, we can gradually classify the text into the body of mathematical statistics. No matter what you do, you must have a “number” in your chest and you should be aware of the number of things. To have an objective understanding of the quantity of things, the only reliable way is to obtain the data through investigation, practice or experiment, and then carry out analysis and research. In scientific experiments, data is very valuable information. Let’s talk about what is “data.” As we all know, 1, 2, and 3 are three numbers, 600 million is a number, and the ratio of the circumference to the diameter of a circle is 3.14158. Actual figures from experiments or surveys, such as acres of plots in a wheat experiment