題組內容

8. The probability mass function P(X = z) of a geometric random variable X is
  61d3dc5400fc5.jpg
 for x = 0,1,... and 0 ＜ θ≤ 1. Consider a random sample of size n and answer the following questions.

b. [8%] Find the Cramer-Rao lower bound for the variance of any unbiased estimate of θ.