I have that a certain action is performed by $N_1$ unique users in a total of $M_1$ times in the control group, and by $N_2$ unique users in a total of $M_2$ times in the treatment group. I want to calculate if the average number of actions performed by the user $(M/N)$ has changed significantly in the treatment group, meaning if $M_2/N_2$ is significantly bigger or smaller than $M_1/N_1$. Which test/method should I use?
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$signs and use_for subscripts.$x_1$comes out as $x_1$. – saulspatz Jan 13 '21 at 14:12