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  3. exercise 63 a weighted sample mean takes the form ywi...

Question: exercise 63 a weighted sample mean takes the form ywi...

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Exercise 6.3 A weighted sample mean takes the form ywi for some non-negative constants ui satisfying n Ση! wi-1. Assume yi s id. (a) Show that y* is unbiased for μ = E(%). (b) Calculate var ). (c) Show that a sufficient condition for y* μ is that (d) Show that a sufficient condition for the condition in part 3 is maxn wio(n) 흡 Σηι w--0

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