How to calculate error of a percentage difference?

I calculated a percentage and I need to find out the error of that percentage. Example: Percentage difference is 10%. How do I find out the plus or minus error? So get something like this "0.41 ±... more


is there any free statistics programs that complete the calculations for you?

I can identify the the correct values for the formulas but sometimes miscalculate the answers.  Is there any online websites that you can click on the corresponding formula and fill in the values... more

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