PakMediNet Discussion Forum : Biostatistics : Margin of Error
Margin of Error
Hello everybody,
Nice to be here 
I am looking for some rear cells by fluorescent staining. I need to know the number of cells I should count to get a satisfactory precision.
I figured I should look at the margin of error. Usually I get a count of my cells between 1% and 5% of all the cells in the sample, and I count about 1000-1500 cells. Using the formula for
margin of error=0.98/sqrt(N) (95% CI)
at N=sample size=1000
I get 3.099%.
Now what does it mean for my value of 1.43%? That it is actually not different from 4.4%
That would be too sad 
Any ideas?
Thank you
Posted by: PavelPosts: 2 :: 13-07-2006 :: | Reply to this Message
Re: Margin of Error
Hi
I am Muhammad Ibrahim.
For finding the ME you must need the standard deviation of the data for which you are going to find the ME.
For further assistance please contant me through email
ibrahim_ap98@yahoo.com
www.biostatspk.com
Posted by: ibrahim_apPosts: 138 :: 30-03-2008 :: | Reply to this Message