NO.PZ2018062016000145
问题如下：
Which of the following statements on F-test is most appropriate?
选项：
A.The samples in F-test not random.
B.F-test conduct the tests concerning differences between the variances of two populations.
C.F-test is a hypothesis test concerning a parameter.
解释：
B is correct. An F-test is used for tests concerning the difference between the variances of two populations(normally distributed populations) , and the samples are independent and random.
比如说原假设H0:μ=μ0，这样的就是一个参数；原假设H0: μ1=μ2，这样的就是两个参数。
u=3.14这种是一个参数，u1=u2这种是两个参数对麻，
这里的u=u0是什么意思
