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problem

So basically, the estimator is a slope of the highest and lowest values. $(Y_7-Y_1)/(X_1^7-X_1^1)$

I already calculated the unbiasedness by since $E(X_1^7) = u_x$ and the same for Y. However, I'm having trouble figuring out how to calculate the variance for this.

Can someone please help me out/get me started? Much appreciated

1 Answers 1

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Note that $Y_i$ are iid $\sigma^2$ and $X_i$ are non-random so $Var(\dfrac{Y_7-Y_1}{X_7-X_1})=\dfrac{2\sigma^2}{(X_7-X_1)^2}$

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    Can you clarify iid? also $2o^2$ with respect to what? – 2017-02-23
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    hello? need clarification please... – 2017-02-24
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    I am sorry, $Y_i$ are independent, not iid. And $Var(Y_i)=\sigma^2$ for all $i$. – 2017-02-26