题目
Each of the following is true about the chi-square and F distributions EXCEPT:
选项
A.The chi-square distribution is used to test a hypothesis about a sample variance; i.e., given an observed sample variance, is the true population variance different than a specified value?
B.As degrees of freedom increase, the chi-square approaches a lognormal distribution and the F distribution approaches a gamma distribution
C.The F distribution is used to test the joint hypothesis that the partial slope coefficients in a multiple regression are significant; i.e., is the overall multiple regression significant?
D.Given a computed F ratio, where F ratio = (ESS/df)/(SSR/df), and sample size (n), we can compute the coefficient of determination 「huixue_img/importSubject/1564169386175107072.png」 in a multiple regression with (k) independent variables (regressors)
答案
B
解析
Both approach a normal distribution; all of the so-called sampling distributions (student t, chi-square, F) approach normal 两者都接近正态分布； 所有所谓的采样分布（学生t，卡方，F）都接近正态分布。