当列联表中的两个变量相互独立时，计算的列联相关系数c( )。[中国海洋大 学2018研]

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30463' and id < 2461319 and id<>'2461319' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30463' and id > 2461319 and id<>'2461319' order by id asc limit 5