Re: Determining Confidence Interval

From: Paige Miller (paige.miller_at_kodak.com)
Date: 09/28/04 

Date: Tue, 28 Sep 2004 10:38:22 -0400

Roger Sherman wrote:
> The requirement:
>
> I wish to establish the Confidence Interval (CI) of an event occurring
> during the play of a card game. Specifically, for example, if I
> assume that an event occurs 20% of the time that a game is played, how
> many game samples must I consider to conclude that the CI of the event
> occurring 20% (or any other percentage) is:
>
> 70%
> 80%
> 90%
> 95%
>
> How do I go about accomplishing the above requirement ?? FYI, I have a
> limited background only in statistics and statistical methods !

Yes, we can tell your background is limited. Your problem is not
phrased the way a statistician would phrase it, and in fact the way
you have phrased it, I don't understand your problem at all.

So let me ask a few questions ... if you know an event occurs 20% of
the time, why do you need a confidence interval? (I think you don't
need one...)

When people compute confidence intervals, we normally do so from
data (although sometimes we compute confidence intervals from
summary statistics like the mean and standard deviation that are
computed from data). You have shown no data. Where is your data?

What do you mean that a confidence interval is 70%? Normally when we
talk about percents, we need to state (or imply) that it is a
percent of something. 70% of what? 

-- 
Paige Miller
Eastman Kodak Company
paige dot miller at kodak dot com
http://www.kodak.com
"It's nothing until I call it!" -- Bill Klem, NL Umpire
"When you get the choice to sit it out or dance, I hope you dance" 
-- Lee Ann Womack

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