diff --git a/18_ADAS-1.ipynb b/18_ADAS-1.ipynb
index 768981cf..cb024c4b 100644
--- a/18_ADAS-1.ipynb
+++ b/18_ADAS-1.ipynb
@@ -1629,8 +1629,8 @@
     "\n",
     "＜帰無仮説＞\n",
     "\n",
-    "* $H_0$：残差は独立分布（無相関）\n",
-    "* $H_A$：$\\rho_{p}\\ne0$"
+    "* $H_0$：残差は独立分布\n",
+    "* $H_A$：残差は独立分布ではない"
    ]
   },
   {
@@ -1799,7 +1799,9 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "jp-MarkdownHeadingCollapsed": true
+   },
    "source": [
     "(sec:18-1-appendix_B)=\n",
     "### 付録Ｂ"