Unbiased estimator example 5 in probability and statistics

[@claudiamesaaparicio8517]

You save me. Thanks so mucho!

[@selvaraj4939]

Mam, in fourth sub division, v(t1)=v(x1+x2-x3) Minus is given in that question, then how you convert it into plus, as per the question, the correct answer of v(t1) is sigma^2. Your fourth subdivision solving method confused me, as per my opinion the correct answe is t2is the best estimator, which is least. Please kindly clear my doubt mam.

[@JoJo-il3qe]

Sister your profession pls..

[@parthibanb8444]

Var(t1) = (-sigma3)^2

[@parthibanb8444]

How is it?

[@Rocky-tn4pk]

If e(t1) is not equal to u than it is not unbiased or what

[@selvaraj4939]

If e(t1) is equal to mue then it is an ubaised estimator. If e(t1) is not equal to mue then it is baised estimator.