欲研究A.B、C三种抗生素治疗单纯性尿路感染的疗效,将120名患者随机分为三组,分别采用三种药物治疗,治疗结果见下表,欲比较三种药物治疗单纯性尿路感染的有效率有无差别,宜采用的统计量为[img=746x175]17b573aa49f40da.png[/img]
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