Question : Find moment estimator of $\displaystyle \theta$ based on a random sample $\displaystyle x_1, x_2,x_3,....,x_n $ of size n from the normal population $\displaystyle N(0,\theta^2)$
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YOU should be trying some of these. answer is $\displaystyle \sqrt{{\sum_{i=1}^n x^2_i\over n}}$
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