Update app.py

app.py

@@ -162,8 +162,8 @@ def read_excel_sheets(file):
         return None
 
 def z_testes(n1, n2, p1, p2):
-    p_hat = (p1 + p2) / (n1 + n2)
-    z = (p1 / n1 - p2 / n2) / ((p_hat * (1 - p_hat) * (1 / n1 + 1 / n2)) ** 0.5)
+    p_hat = ((n1*p1) + (n2*p2)) / (n1 + n2)
+    z = (p1 - p2) / ((p_hat * (1 - p_hat) * (1 / n1 + 1 / n2)) ** 0.5)
     p_value = 2 * (1 - norm.cdf(abs(z)))
     return p_value