My Math Forum  

Go Back   My Math Forum > High School Math Forum > Probability and Statistics

Probability and Statistics Basic Probability and Statistics Math Forum


Reply
 
LinkBack Thread Tools Display Modes
November 20th, 2008, 05:20 PM   #1
Newbie
 
Joined: Nov 2008
From: houston, texas

Posts: 2
Thanks: 0

statistics

hi all, someone please help me.....
let x1,x2,.....xn be a random sample of size n from N(u, q^2=theta),o<theta<infinity, where u is known. show that y=(1/n)Ei=1(xi-u)^2 is an unbiased estimator of theta.

thank you for the help.
aali02 is offline  
 
November 21st, 2008, 02:43 PM   #2
Global Moderator
 
Joined: May 2007

Posts: 6,625
Thanks: 622

Re: statistics

Quote:
Originally Posted by aali02
hi all, someone please help me.....
let x1,x2,.....xn be a random sample of size n from N(u, q^2=theta),o<theta<infinity, where u is known. show that y=(1/n)Ei=1(xi-u)^2 is an unbiased estimator of theta.

thank you for the help.
By definition E[(xi-u)^2] = theta, for each i. Therefore E(y)=theta.
mathman is offline  
Reply

  My Math Forum > High School Math Forum > Probability and Statistics

Tags
statistics



Thread Tools
Display Modes


Similar Threads
Thread Thread Starter Forum Replies Last Post
Statistics gaussrelatz Probability and Statistics 4 January 25th, 2013 04:55 AM
best introduction to statistics book? not applied statistics ElMarsh Advanced Statistics 2 October 23rd, 2009 06:10 PM
statistics help kage Probability and Statistics 1 February 15th, 2009 02:51 AM
statistics sandeep641 Probability and Statistics 0 February 8th, 2009 10:00 AM
statistics mwe Probability and Statistics 0 January 12th, 2009 06:31 AM





Copyright © 2018 My Math Forum. All rights reserved.