From a Poission distribution with mean 2, let y1, y2, y3, ... , yn be a random sample. The following estimators of A: Â2 = n(y1 + y2 + ·…·+ yn) Yı + y2 2 y1 1. Which of the above estimators is/are unbiased? Justify. 2. Which of the above is/ are biased? Compute for the bias. 3. Which of the estimators have the smallest variance?

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