# Math Help - Unbiased estimator

1. ## Unbiased estimator

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I have done part i and ii, and I am stuck on part iii.

How do I show it is an unbiased estimator?

Thanks.

2. find its expected value. it should be $\alpha + 10\beta$.

If you want more detail than that, tell us what your proposed estimator is.

3. use $\hat\alpha +10\hat\beta$ where

$\hat\alpha,\hat\beta$ are the usual estimators of $\alpha,\beta$