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“独立性检验的基本思想及初步应用”是新课标新增内容之一,也是传统统计内容的延续.本文探讨学生学习中感到困惑的两个问题.一、对“小概率事件”的理解所谓小概率事件原则是:如果一个事件发生的概率很小,那么在一次实验中,实际上可把它看成不可能发生的,如果在一次实验中,某个小概率事件竟然发生了,那么就认为这是一种反常现象.为了便于学生理解,举例如下:例1某厂每天产品分三批包装,规定每批产品的次品率都低于0.01才能出厂.若产品符合出厂要
“The basic idea of the independence test and its preliminary application ” is one of the new content of the new curriculum standard, but also the continuation of the traditional statistical content.This paper discusses two problems confusing student learning.First, the “small probability event ”The so-called principle of small probability events is: If the probability of an event is small, then in an experiment, in fact, can regard it as impossible, if in an experiment, a small probability event unexpectedly For example, the following is an example: Example 1 A factory’s products are packaged in three batches each day, requiring each batch of products have a defect rate of less than 0.01 before they can be shipped out. If the product meets the requirements Factory to