Paul Sullivan asked about a confidence interval for a zero proportion.
I have a web page that talks briefly about the rule of three that Mark Ebell
mentioned. You can currently find it on the "Ask Professor Mean" page (look
for "Rule of Three"), but I'm going to revise these pages soon and it will
then be under a new page about sample size calculations (look for a page
with the name size.htm).
Steve Simon, [log in to unmask], Standard Disclaimer.
Ask Professor Mean: http://www.cmh.edu/stats/profmean.htm
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