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Help needed for sample size determination

H. Woo h.woo at sct.gu.edu.au
Tue May 14 00:08:19 EST 1996

I should be grateful if someone would tell me which equation to use for 
calculating the sample size for the following situation:

I have looked at one particular biological property of 40 different 
serotypes of a species of bacteria. Seven discreet forms have been 
observed. There are 200 known serotypes in this species. Is 40 greater or 
less than the minimum sample size assuming 95% confidence level? The 
purpose of this experiment is to see if this species of bacteria can be 
put into sub-groups according to this biological property.

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