题目：
The use of the F - distributed test statistic,
,to compare the variances of two populations requires all of the following EXCEPT:（）
A. two samples are of the same size.
B. samples are independent of one another.
C. populations are normally distributed.
答案：
参考答案：A
解析：
The F - statistic can be computed using samples of different sizes. That is, n1 need not be equal to n2.
至适中