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4. The number of times a first-year college student calls home during the week is a Poisson RV with mean λ: X ~ Poisson(A). Curious to find the value for λ, you break into the SA (!) and access phone records for n random weeks. You record the number of calls home and get the random sample X1,..., Xn. a. Find an unbiased estimator of A and prove it is unbiased b. Youre curious how many total minutes, M, these X calls amount to in a week, and you read a recent journal article that suggests the model M 2X +3X2. Find the expected number of weekly minutes as an expression involving λ.

c. Find an unbiased estimator of E(M) (your answer from part b), call it M, based on the random sample Xi, X2,... ,Xn-

math   Statistics-And-Probability   
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