Stat312: Sample Midterm IIMoo K. ChungSeptember 30, 20041. LetX1,· · ·, Xnbe a random sample from Bernoullidistribution with parameterp.(a) What isE(S2/p2)?S2is the sample variance. Ex-plain your results (10 points).(b) Find an unbiased estimator ofp2.Explain yourresults (5 points).2. LetX1, X2be a random sample fromN(0,1/θ). Notethat the sample size is 2 and the density function forXiisf(xi) =√θ√2πexp(-θx2i/2).(a) Obtain an estimator ofθusing the method of mo-ments. Explain your results (5 points).(b) Find the likelihood function and use it to obtain themaximum likelihood estimator ofθ. (5 points foreach question).