# Math Help - Find moment estimator

1. ## Find moment estimator

Question :

Find moment estimator of $\theta$ based on a random sample $x_1, x_2,x_3,....,x_n$ of size n from the normal population $N(0,\theta^2)$

2. YOU should be trying some of these.

answer is $\sqrt{{\sum_{i=1}^n x^2_i\over n}}$