Question: Again, let Y1,..., Yn be as defined in Exercise 7.19. a. Show that [(Yi/xi)] is also an unbiased estimator of . b. Calculate the exact

Again, let Y1,..., Yn be as defined in Exercise 7.19.
a. Show that [∑(Yi/xi)] is also an unbiased estimator of β.
b. Calculate the exact variance of [∑(Yi/xi)] /n and compare it to the variances of the estimators in the previous two exercises.

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