From a Poission distribution with mean 1, let y1, y2, Y3, ... , yn be a random sample. The following estimators of a: â = y â2 = n(y1 + y2 + ·…·+ yn) Yı + y2 âz = 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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A: 1st answer is correct, given in the tutor solution. Because here (cosh y) is constant.  3rd option…

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A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

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A: Dear student, Since you have posted two questions, as per our policy we will answer first question.…

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Q: Could you provide assistance with the first three questions?

A: Note: Hey there! Thank you for the question. As per your request, we have solved the first three for…