ZSs Posted December 14, 2013 Share Posted December 14, 2013 (edited) Hi,,,can u please explain me how to calculate standard deviation and standard error for a binomial distribution when you have several samples? For exapmple, I don't know the population size. I take a sample of 10 and check for a particular characteristic. Let's say number of successes for this sample is x. So the proportion of successes is x/n. Then I repeat this process for 3 times. That means I take 3 samples. Then I'll calculate the mean for these 3 samples. So how do I calculate standard deviation or standard error for this mean value? Eg: Sample 1 => x/n = x/10 =3/10 =30% Sample 1 => 30% +- a Sample 2 => 32% +-b Sample 3 => 32% +- c Mean = 31.33% +-d How do I calculate a,b,c and d? And what if I have different sample sizes for the three occasions? (having 10, 15, 8 instead of 10,10,10) Thank you very much for your help Edited December 14, 2013 by ZueSz Link to comment Share on other sites More sharing options...

Biostat_Assistant_Prof Posted December 14, 2013 Share Posted December 14, 2013 Wrong type of forum Quant_Liz_Lemon 1 Link to comment Share on other sites More sharing options...

ZSs Posted December 15, 2013 Author Share Posted December 15, 2013 Sorry,,, Link to comment Share on other sites More sharing options...

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