Interval Explorer for Two Independent Sample Proportions

[#1]

I want to calculate sample size to compare failure rates between two groups.

I expect that group 1 has a failure rate of around 1%, and group 2 something similar or hopefully lower.

I have turned to the JMP platform Interval Explorer for Two Independent Sample Proportions, and filled:

Group 1 proportion = 0.01

Group 2 proportion = 0.01

but I am unsure with what to fill Margin of Error. Is this the desired confidence interval around the group proportions?

[#2 · Accepted solution]

Hello, and welcome. Yes, it is the desired confidence interval.  See the help file here for how the margin of error is calculated. It is defined therein as the " the half-width of a two-sided interval or the width of a one-sided interval. "

Margin of Error for Two Independent Sample Proportions (jmp.com)