问题如下:
How much probability is within of the mean of a normal random variable?
选项:
解释:
Formally this quantity is 95.45%, but this area is commonly approximated as 95%.
这里是查表得到z=2的尾端概率为0.0228,因为是双尾,所以两边剔除掉两倍的尾端概率,用1-0.0228*2=95.44%这样得出的吗?
NO.PZ2020010303000005 问题如下 How muprobability is within ±2σ\pm2\sigma±2σ of the meof a normranm variable? Formally this quantity is 95.45%, but this area is commonly approximate95%. 这个题目考的是不是置信区间?2倍标准差之间的面积(概率)不应该是68%吗?
NO.PZ2020010303000005 问题如下 How muprobability is within ±2σ\pm2\sigma±2σ of the meof a normranm variable? Formally this quantity is 95.45%, but this area is commonly approximate95%. 请问为什么可以直接用标准正态分布查表,题目中只说的是normal
NO.PZ2020010303000005 问题如下 How muprobability is within ±2σ\pm2\sigma±2σ of the meof a normranm variable? Formally this quantity is 95.45%, but this area is commonly approximate95%. 已知95%——1.95;99%——2.58,内插法计算?——2,可以吗?
这道题翻译成中文怎么理解呀,应该怎么查表?
老师请问很多查表的题目没给出表,有没有可以下载表的地方。