Let X1,...,Xn iid∼ P(λ). As you know, the parameter λ is both the mean and the variance of the Poisson distribution. The sample mean and the sample variance are both unbiased estimators of λ. Which...

Let X1,...,Xn

iid∼ P(λ). As you know, the parameter λ is both the mean and the variance

of the Poisson distribution. The sample mean and the sample variance are both unbiased

estimators of λ. Which one has the smaller variance?