题目内容
用于表示均数抽样误差大小的统计指标是
2021-10-13
A.方差
B.标准差
C.标准误
D.变异系数
E.离均差平方和
试卷相关题目
SQL Error: select id,body,options from ***_enewstiku where sourceid='25581' and id < 2153286 and id<>'2153286' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25581' and id > 2153286 and id<>'2153286' order by id asc limit 5