diff --git a/CogModelingRNNsTutorial/plotting.py b/CogModelingRNNsTutorial/plotting.py
index 65b0b6e..56e1a0b 100644
--- a/CogModelingRNNsTutorial/plotting.py
+++ b/CogModelingRNNsTutorial/plotting.py
@@ -6,7 +6,7 @@
 
 def confidence_interval(data, alpha=0.95):
     return st.t.interval(
-        alpha=alpha, df=len(data)-1, loc=np.mean(data), scale=st.sem(data))
+        alpha, df=len(data)-1, loc=np.mean(data), scale=st.sem(data))
 
 
 def action_similarity_to_history(experiment_list, n):