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The only part I don't understand is why they put E in front of 2X at the very beginning?
2026-04-02 01:23:18.1775092998
Mean of a random sample from a Uniform Distribution
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The bias of $2\overline{X}$ is given by $B(2\overline{X}) = E(2\overline{X}) - \alpha$. Then they proceeded to show the bias was nonzero because $E(2\overline{X}) = 1 + \alpha$.