have a final exam on monday, and cannot figure out the stuff on estimators: 1) a random sample of size 2, y1, y2 is drawn from the pdf f(y, theta) = 2y(theta^2), 1 < y < 1/theta. what must c equal if the statistic c(y1 + 2y2) is to be an unbiased estimator for 1/theta. I really dont know how to approach anything that asks about estimators. I know that unbiasedness implies E(theta) = theta. But how do I work this problem? 2. Let y1....y2....yn be a random sample size n from pdf fy(y;theta) = 2y/theta^2, 0 <y < y < theta. show that W = 3/2n summation (Yi) is a unbiased estimator theta.