I have a clinical trail where all the patients sufferd from a stroke.

I need to assess the efficacy of the drug treatment (drug/placebo) for the entire sample by using the z-test in excel.

I have the values if the drug treatment was a succes or a failure for each patient.

My quesiton is what is the null hypothesis and the alternative, cause i have no idea what to write for z-test of proportions.

I did also a chi-square test and the null hypothesis was: the drug treatment and its result are independent / and the alternative hypothesis was : the drug treatment and its result are dependent,

maybe it can helps!

THANKS A LOT!!!!