Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
sci.math.*
»
sci.stat.math
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
Problem regarding sampling and estimation
Replies:
1
Last Post:
Jul 16, 2012 2:59 PM



Dirac
Posts:
1
Registered:
7/11/12


Problem regarding sampling and estimation
Posted:
Jul 11, 2012 2:41 PM


Let's say there are N chunks of metal, each are 4 inches thick. They can be processed and reduced to 1 of following possible sizes: 1, 2, 3 or 4 inches.
If we were to use sampling to get an estimate of possible reduction in the total number of inches in all the N chunks combined, how would we determine the optimal sample size, and the formula for estimation, variance and accuracy?
Any pointers to a solution of similar category of problems is much appreciated.
I am thinking of this like a polling problem, where M/N people are asked to answer a multiple choice question. For eg. each chunk is asked, how many inches can be reduced from you? There are 4 answers. Most of the sampling theory stuff on the web talks about answering yes/no questions. Is there some theory which talks about multiple choice questions?
Thanks.



