用K 2 Cr 2 O 7 作基准试剂,对Na 2 S 2 O 3 溶液的浓度进行测定,共做了四次,测得其浓度(mol/L)为:0.1042、0.1044、0.1045、0.1047。问上述各值中是否有该舍去的离群值(用Q检验法进行判断,设置信度为90%)。
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