问题如下图:
选项:
A.
B.
C.
解释:
老师好,题中只给出样本的方差,总体方差未知,不应该用t检验吗
t-test. F-test. A is correct, if the population is normally stributewith a known variance, then the test statistic for a hypothesis test concerning a single population mean, the Z-test is applie 我被这题的答案弄糊涂了。总体方差已知,要么是x方,要么是F test。怎么是T test。T test不是已知mean吗?
这里sample意思不是样本方差已知吗?总体方差未知,不是应该用t检验吗?