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Let X1,X2...Xn be i.i.d. with N(theta, 1) a) find the CR Rao lower-band for the variance...

Let X1,X2...Xn be i.i.d. with N(theta, 1)

a) find the CR Rao lower-band for the variance of an unbiased  estimator of theta

b)------------------------------------of theta^2

c)-----------------------------------of P(X>0)

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