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    Perform a z test for 2 proportions without knowing favorable cases

    Of course. Thank you for your help. I want to use the formula below: Z = (proportion 1 - proportion 2) - 0 / square root (overall proportion (1-overall proportion) (1/sample size 1 + 1/sample size 2) You can find the formula here: https://www.socscistatistics.com/tests/ztest/ For the online...
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    Perform a z test for 2 proportions without knowing favorable cases

    Hi all. I have been trying to understand how to calculate a z test for two proportions by hand. Here's how I currently do it. My data in Excel gives me the two sample sizes. Then, I use an online z test calculator. 1) I supply the 2 sample sizes 2) For sample 1, I supply a constant proportion...