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1. Let o = 1 and consider the special case of only two observations (n = 2). Write down a formula for the mean squared error E [(O1 - O1 )"], as a function of t and t2. Enter t_1 for t and t_2 for t2. E[(@1 - 01) 1 = 2. Consider the "experimental design" problem of choosing when to make measurements. Under the assumptions of the previous part, and under the constraints 0