Question: 2. Let Y1, Y2, ..., Yn be independently and identically distributed with mean 0 and variance o2. Find the nonnegative quadratic unbiased esti- mate of

2. Let Y1, Y2, ..., Yn be independently and identically distributed

2. Let Y1, Y2, ..., Yn be independently and identically distributed with mean 0 and variance o2. Find the nonnegative quadratic unbiased esti- mate of of with the minimum variance

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