问题如下图:
选项:
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C.
解释:
问一下这题考查的知识点
NO.PZ2017092702000080问题如下For a binomiranm variable with five trials, ana probability of success on eatriof 0.50, the stribution will be:A.skeweB.uniform.C.symmetric. C is correct. The binomistribution is symmetric when the probability of success on a triis 0.50, but it is asymmetric or skeweotherwise. Here it is given thp = 0.50当试验成功的概率为 0.50 时,二项分布是对称的。另当p=0.1时二项分布是右偏的,当p=0.9时二项分布是左偏的。 这个问题对应讲义的哪部分内容呢?
NO.PZ2017092702000080问题如下 For a binomiranm variable with five trials, ana probability of success on eatriof 0.50, the stribution will be:A.skeweB.uniform.C.symmetric. C is correct. The binomistribution is symmetric when the probability of success on a triis 0.50, but it is asymmetric or skeweotherwise. Here it is given thp = 0.50当试验成功的概率为 0.50 时,二项分布是对称的。另当p=0.1时二项分布是右偏的,当p=0.9时二项分布是左偏的。 为何P小于0.5是右,大于是左?能画图下吗
NO.PZ2017092702000080 B为什么错误?每一个的概率不都是0.5,所以是uniform?
所以这道题就是记住 P=0.5 binominstribution is symmetric嘛?结论怎么来的呢?
我看到助教之前的解答里,“当p=0.1时二项分布是右偏的,当p=0.9时二项分布是左偏的。” 请问这是为什么呀