In Minitab under "power and sample size for 1 proportion or 2 proportions", is the comparison proportions same as margin of error while calculating sample size for proportions. If ETOP or the hypothesized proportion of a population of interest is 20% then would we be putting 5% in comparison proportions assuming 5% margin of error and 90% power. Please advise.  

Hello Pradeep

 

Comparison proportion is not same as Margin of Error. Comparison proportion is the hypothesized proportion plus or minus the margin of error.

 

so in your case, if hypothesized proportion is 20% and margin of error is 5%, then comparison proportion will become 15% or 25%

 

Below is how you will enter the details in Minitab. (In Comparison proportion, you can also choose to enter any one value. If entering 2 values, give a space between them).

 

 

Thanks a lot, Mayank.