设X1，X2，…，Xn为随机样本，则哪个统计量能较好地反映样本值的分散程度?( )[中山大学2012研]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30463' and id < 2461310 and id<>'2461310' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30463' and id > 2461310 and id<>'2461310' order by id asc limit 5