diff --git a/HowBadIsMyBatch.ipynb b/HowBadIsMyBatch.ipynb
index bc8d2b2da96..fc07d8bd831 100644
--- a/HowBadIsMyBatch.ipynb
+++ b/HowBadIsMyBatch.ipynb
@@ -102,7 +102,7 @@
     "    @staticmethod\n",
     "    def normalize(dataFrame):\n",
     "        DataFrameNormalizer.convertVAX_LOTColumnToUpperCase(dataFrame)\n",
-    "        DataFrameNormalizer.convertColumnsOfDataFrameToNumerics(\n",
+    "        DataFrameNormalizer._convertColumnsOfDataFrameToNumerics(\n",
     "            dataFrame,\n",
     "            ['DIED', 'L_THREAT', 'DISABLE', 'HOSPITAL', 'ER_VISIT'])\n",
     "\n",
@@ -111,7 +111,7 @@
     "        dataFrame['VAX_LOT'] = dataFrame['VAX_LOT'].str.upper()\n",
     "\n",
     "    @staticmethod\n",
-    "    def convertColumnsOfDataFrameToNumerics(dataFrame, columns):\n",
+    "    def _convertColumnsOfDataFrameToNumerics(dataFrame, columns):\n",
     "        for column in columns:\n",
     "            DataFrameNormalizer._convertColumnOfDataFrameToNumeric(dataFrame, column)\n",
     "\n",