怎么计算置信水平在知道置信区间的情况下The police came up with a confidence interval (0.3033,0.4967) for the proportions of teenage drivers who are involved in accidents.What confidence level did the police use (in percent)?
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怎么计算置信水平在知道置信区间的情况下The police came up with a confidence interval (0.3033,0.4967) for the proportions of teenage drivers who are involved in accidents.What confidence level did the police use (in percent)?
怎么计算置信水平在知道置信区间的情况下
The police came up with a confidence interval (0.3033,0.4967) for the proportions of teenage drivers who are involved in accidents.What confidence level did the police use (in percent)?
怎么计算置信水平在知道置信区间的情况下The police came up with a confidence interval (0.3033,0.4967) for the proportions of teenage drivers who are involved in accidents.What confidence level did the police use (in percent)?
这个问题可以看成两点分布,作为两点分布的概率,一般服从正态分布,均值也是可以用置信区间逆推的,但是你不知道样本数啊,怎么能搞的出来置信水平呢?
恩,帮你算算,逆推样本均值为average(0.3033,0.4967)=0.3985,标准差[0.3985*(1-0.3985)]^(1/2)=0.4896,得Z/n^(1/2)=0.194,猜测常用Z值无非1.96和1.65,那么如果样本在100人左右的话置信度就是95%,73人左右的话置信度就是90%,这两个最有可能.另外,177人的样本置信度在99%,45人的话置信度只有80%,样本要是上了250,置信度就到四个九了.
此贴必火
随便翻一本概率论数理统计书上都有啊