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Saad Amer

You can use this site for sample size calculation when comparing two Proportions: http://www.select-statistics.co.uk/sample-size-calculator-two-proportions

and this site when comparing means: http://www.select-statistics.co.uk/sample-size-calculator-two-means

Eliphas GITONGA

Thank you Saad

Ijaz Ahmad

I agree with Saad Amer . pl. use links supplied by him.

That depends on the expected effect of your intervention based on preliminary data or published studies. If you are expecting a certain amount of increase (e.g. 10) in the mean of the variable of interest, then in the control group you you put the mean of the normal population and in the study group you put the mean+10. With regards to proportions, if you expect a difference of e.g. 20% and you know that the control is e.g. 40% the n the study group will be 60%. You should then put 0.4 for the control and 0.6 for the treatment. Let me know if it is still not clear.

Thank you for these responses