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fdzh · 2023年10月31日

请问不能使用其他三个distribution进行检验的原因是什么?

NO.PZ2023091601000056

问题如下:

An analyst wants to test whether the standard deviation of return from pharmaceutical stocks is lower than 0.2. For this purpose, he obtains the following data from a sample of 30 pharmaceutical stocks. Mean return from pharmaceutical stocks = 8%. Standard deviation of return from pharmaceutical stocks = 12%. Mean return from the market = 12%. Standard deviation of return from the market = 16%. What is the appropriate test statistic for this test?

选项:

A.

t-statistic

B.

z-statistic

C.

F-statistic

D.

χ2 statistic

解释:

Tests of the variance (or standard deviation) of a population requires the chi-squared test.

如题

1 个答案

品职答疑小助手雍 · 2023年11月02日

同学你好,这题没办法用排除法,是因为题面描述的情况基本就是卡方检验适用的定义了,所以直接选D。