摘要
计算了随机变量(2χ~2)^(1/2)的数学期望和方差,比较分析了随机变量(2χ~2)^(1/2)-2n^(1/2)与(2χ~2)^(1/2)-(2n-1)^(1/2)的近似分布的相同和不同之处,并且利用2χ2的近似分布的正态性,建立了多总体标准差的检验法.
This paper calculated the mathematical expectation and the variance of the distribution of random variable √2x^2. Furthermore, the paper compared the common and difference of √2x^2-√2n-1 the approximate distribution. The paper also used the approximate normality of √2x^2 to built a test method for population standard deviation.
出处
《大学数学》
2010年第2期181-184,共4页
College Mathematics
