NO.PZ2020010304000035
问题如下:
An experiment yields the following data:
It is hypothesized that the data comes from a uniform ditribution, U(0, b).
a. Calculate the sample mean and variance.
b. What are the unbiased estimators of the mean and variance?
c. Calculate the b in U(0, b) using the formula for the mean of a uniform distribution and the value of the unbiased sample mean found in part b.
d. Calculate the b in U(0, b) using the formula for the variance of a uniform distribution and the value of the unbiased sample variance found in part b.
解释:
a. Use the standard formual to get the sample variance(here, n=15)
b.The sample mean is already unbiased.
For the variance:
c.The mean for a U(a,b) distribution is given as:
μ=(a+b)/2
0.385=(0+b)/2
b=0.77
d. The variance for a U(a,b) distribution is given as:
样本均值应等于A加B然后除以2;无偏均值就是该均值。样本方差等于B减去A 平方然后除以12。解题公式不知道什么意思。最后两问不知道在说什么。均匀分布到底应该怎么计算?谢谢。尤其是最后两个问题在说什么。感觉均匀分布前提和适用场景特别不清楚。烦请详细说明,谢谢