From b46950bc964823590f5cfb62dee321c26cf4498b Mon Sep 17 00:00:00 2001
From: 7a4c0ea8dd604d935d3ecc0572dc77a9
 <7a4c0ea8dd604d935d3ecc0572dc77a9@app-learninglab.inria.fr>
Date: Sat, 1 Nov 2025 13:25:16 +0000
Subject: [PATCH] no commit message

---
 module2/exo5/exo5_fr.ipynb | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/module2/exo5/exo5_fr.ipynb b/module2/exo5/exo5_fr.ipynb
index 26ad6d9..6203509 100644
--- a/module2/exo5/exo5_fr.ipynb
+++ b/module2/exo5/exo5_fr.ipynb
@@ -686,6 +686,30 @@
     "analyse et de regarder ce jeu de données sous tous les angles afin\n",
     "d'expliquer ce qui ne va pas."
    ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Critical Review of the Challenger O-ring Analysis\n",
+    "\n",
+    "After reproducing the historical analysis, three reasoning errors became clear:\n",
+    "\n",
+    "1. **Key data were excluded** — the engineers only considered flights that showed O-ring damage, ignoring those with no damage. This introduced selection bias.\n",
+    "2. **Extrapolation beyond available data** — the Challenger launch temperature (~0 °C) was far below any recorded temperature in the dataset, so the predicted risk was unreliable.\n",
+    "3. **Uncertainty ignored** — the logistic regression results were interpreted without accounting for uncertainty (no confidence intervals), creating a false sense of precision.\n",
+    "\n",
+    "By including all flights, plotting the full dataset, and visualizing uncertainty bands, we can see that the risk of failure increases sharply at lower temperatures — meaning that the Challenger launch conditions were clearly unsafe.\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "\n"
+   ]
   }
  ],
  "metadata": {
@@ -705,7 +729,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.3"
+   "version": "3.6.4"
   }
  },
  "nbformat": 4,
-- 
2.18.1