【简答题】
1980年甲乙两医院病死率如下表,试分析两医院的总病死率有无差别。<br /> <img src="https://nimg.ppkao.com/2019-07/wangyuqiao/2019070910164679698.jpg?sign=b28afa7b9c643ba616ac0504940d4204&t=62e34122" /><br /> <img src="https://nimg.ppkao.com/2019-07/wangyuqiao/2019070910165637817.jpg?sign=6d490fb4ba0e33af33891cb95b98e61e&t=62e34122" />
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