diff --git a/confianza.py b/confianza.py
new file mode 100644
index 0000000000000000000000000000000000000000..a327142f40476363e3cd4aed743177aae9fe1022
--- /dev/null
+++ b/confianza.py
@@ -0,0 +1,10 @@
+import csv
+import math
+
+def confianza(xa, xb, sa, sb, na, nb):
+    d = xa - xb
+    s = math.sqrt(((sa ** 2) / na) + ((sb ** 2) / nb))
+    intervalo = (d - 1.96 * s, d + 1.96 * s)
+    return intervalo
+
+print(confianza(11226, 3342.3, 7350.85, 1651.23, 1912, 6424))
\ No newline at end of file