为什么选C不选A呢

不选C吗

An analyst wants to test whether the samples selecting from a population are random, he should choice: A B C 为什么用非参数检验呢？不符合老师课上说的3点

Which of the following statements about hypothesis testing is least accurate? A A type I error is to reject the null when it is actually true. B The significance level equals the probability of a Type I error. C A two-tailed test with a significance level of 5% has z-critical values of ±1.65. b有点不明吧，significance level 指的是两边的区域吧，可以定义为type1吗？

老师，是题中本身capital gain distribution, 就是一种有问题的说法吗？那种利得属于capital gain distribution呢？麻烦能举例吗？

The dollar discount on a US Treasury bill with 91 days until maturity is $2,100. The face value of the bill is $100,000. The bank discount yield of the bill is closest to: A 8.58%. B 8.40%. C 8.31%. The dollar discount on a US Treasury bill with 91 days until maturity is $2,100.这句话的意思就是差值是f-p=2100？？

An analyst gathered information about three economic variables, He noted that whenever variable A increased by one unit, variable C increased by 0.6 units but variable B decreased by 0.7 units. The correlation between variables A and B and the correlation between variables A and C respectively, are closest to: A Answer A B Answer B C Answer C 这题在问啥？

这道题的知识点在哪

The following information is about the price earning (P/E) ratios for the common stocks held in a manager’s portfolio: The relative frequency and the cumulative relative frequency, respectively, for interval II are closest to: A Relative frequency is 20% ; Cumulative relative frequency is 85% B Relative frequency is 22%; Cumulative relative frequency is 36% C Relative frequency is 22%; Cumulative relative frequency is 85% 出错了。无答案

这道题的知识点在哪里