By using *Maximum Likelihood Estimator* I found

\(\hat\sigma^2=\frac{\sum r_i^2}{n}\)

where \(r\) is the radius of the circle and \(r\sim N(0,\sigma^2)\).

Then i am stucked to find the unbiased estimator of the area of the circle

- Thread starter Cynderella
- Start date
- Tags estimation inference normal distribution point estimator unbiased estimator