题目内容
在两样本均数比较的t检验中,无效假设是
2021-10-13
A.两样本均数不等
B.两样本均数相等
C.两总体均数不等
D.两总体均数相等
E.样本均数等于总体均数
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SQL Error: select id,body,options from ***_enewstiku where sourceid='25581' and id < 2153295 and id<>'2153295' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25581' and id > 2153295 and id<>'2153295' order by id asc limit 5