diff --git a/infocalc.py b/infocalc.py
index 5e3527b..076ca3e 100755
--- a/infocalc.py
+++ b/infocalc.py
@@ -107,11 +107,13 @@ df = samplesize - 1
     
 prob = 0
 if args.upperbound and args.lowerbound:
-    prob = t.cdf(df,args.upperbound, mean, stddev) - t.cdf(df,args.lowerbound, mean, stddev)
+    prob_upper = t.cdf(df=df,x=args.upperbound, loc=mean, scale=stddev)
+    prob_lower = t.cdf(df=df,x=args.lowerbound, loc=mean, scale=stddev)
+    prob = prob_upper - prob_lower
 elif args.upperbound:
-    prob = t.cdf(df,args.upperbound, mean, stddev)
+    prob = t.cdf(df=df,x=args.upperbound, loc=mean, scale=stddev)
 elif args.lowerbound:
-    prob = 1 - t.cdf(df,args.lowerbound, mean, stddev)
+    prob = 1 - t.cdf(df=df,x=args.lowerbound, loc=mean, scale=stddev)
 else:
     prob = 1# no bounds set!
 #print("probability: %f", prob)
diff --git a/tests.sh b/tests.sh
index a9521dc..2c072de 100755
--- a/tests.sh
+++ b/tests.sh
@@ -3,4 +3,4 @@
 echo "Loading data from file"
 ./infocalc.py --lowerbound 0.9 --upperbound 1.1 --graphinfo DATA testdata.csv data1
 echo "Creating simulated curve from parameters"
-./infocalc.py --lowerbound 0.9 --upperbound 1.1 SIM 8 1.0 0.5 
+./infocalc.py --lowerbound 0.1 --upperbound 1.5 SIM 8 1.0 0.5