diff --git a/spotifyvis/tests.py b/spotifyvis/tests.py
index 8a9a2d5..b88c1e2 100644
--- a/spotifyvis/tests.py
+++ b/spotifyvis/tests.py
@@ -17,6 +17,7 @@ class UpdateStdDevTest(TestCase):
         self.assertTrue(math.isclose(new_mean, 7.5, rel_tol=0.01))
         self.assertTrue(math.isclose(new_std_dev, 3.5355, rel_tol=0.01))
 
+
     def test_three_data_points(self):
         """
         tests if update_std_dev behaves correctly for three data points
@@ -28,7 +29,8 @@ class UpdateStdDevTest(TestCase):
 
         self.assertTrue(math.isclose(new_mean, 10, rel_tol=0.01))
         self.assertTrue(math.isclose(new_std_dev, 5, rel_tol=0.01))
-    
+
+
     def test_four_data_points(self):
         """
         tests if update_std_dev behaves correctly for four data points
@@ -41,7 +43,6 @@ class UpdateStdDevTest(TestCase):
         self.assertTrue(math.isclose(new_std_dev, 6.455, rel_tol=0.01))
 
 
-
     def test_five_data_points(self):
         """
         tests if update_std_dev behaves correctly for five data points
@@ -51,4 +52,16 @@ class UpdateStdDevTest(TestCase):
 
         new_mean, new_std_dev = update_std_dev(cur_mean, cur_std_dev, 63, 5) 
         self.assertTrue(math.isclose(new_mean, 22.6, rel_tol=0.01)) 
-        self.assertTrue(math.isclose(new_std_dev, 23.2658, rel_tol=0.01))
\ No newline at end of file
+        self.assertTrue(math.isclose(new_std_dev, 23.2658, rel_tol=0.01))
+
+    
+    def test_sixteen_data_points(self):
+        """
+        tests if update_std_dev behaves correctly for sixteen data points
+        """
+        cur_mean = 0.4441 
+        cur_std_dev = 0.2855 
+
+        new_mean, new_std_dev = update_std_dev(cur_mean, cur_std_dev, 0.7361, 16) 
+        self.assertTrue(math.isclose(new_mean, 0.4624, rel_tol=0.01)) 
+        self.assertTrue(math.isclose(new_std_dev, 0.2853, rel_tol=0.01))
\ No newline at end of file