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Posted by Michael Branham on July 03, 1998 at 10:39:01:
In Reply to: Confidence levels / Margin of error posted by David Whitehouse on July 03, 1998 at 10:05:45:
Standard error for a sample size of 100, assuming an infinite universe and percentage of 50% at 90% confidence level, is 8.2875%.
Standard error for a sample size of 150, assuming the same, is 6.7536%.
Decision Analyst offers a useful program called STATS that includes a feature for calculating standard error. You can download it for free at their website.
Subject: Re: Re: Confidence levels / Margin of error