题目内容
作两样本均数f检验时，前提条件之一是
2021-10-11
A.两总体均数不等
B.两总体均数相等
C.两总体方差不等
D.两总体方差相等
E.以上都不对
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SQL Error: select id,body,options from ***_enewstiku where sourceid='25429' and id < 2141932 and id<>'2141932' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25429' and id > 2141932 and id<>'2141932' order by id asc limit 5