Please explain in details, and I don't want answers copied from other WEBSITES ANSWERS. Thanks!

# 1

Let X1, ..., Xn be a random sample from N(0, 0), 0 >0. (a) Find a complete sufficient statistic if such exists. (b) Argue that X is not an UMVUE of d.Let X1, ..., X. be a random sample from the geometric density f(x; 0)=0(1 - 0)*1(0, 1. ...) (x) where 0