diff --git a/ukol.ipynb b/ukol.ipynb
index 43947ed..b894fab 100644
--- a/ukol.ipynb
+++ b/ukol.ipynb
@@ -32,6 +32,7 @@
     "import pandas as pd\n",
     "#np.set_printoptions(precision=3)\n",
     "#from sympy import *\n",
+    "from scipy import stats \n",
     "from scipy.stats import norm, uniform, expon\n",
     "#from scipy.optimize import minimize"
    ]
@@ -342,6 +343,57 @@
     "(1b) Pro každou skupinu zvlášť spočítejte oboustranný 95% konfidenční interval pro střední hodnotu."
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "69ad2d59-bdc0-4cc7-b51c-7453f2126157",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def conf_interval(data, name):\n",
+    "    conf = stats.t.interval(confidence = 0.95, df = len(data) - 1, loc = np.mean(data), scale = stats.sem(data))\n",
+    "    print(f\"Oboustranný konfidenční interval 95% střední hodnoty skupiny \\\"{name}\\\":\", conf)\n",
+    "    return conf"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "16ee6a87-8b6a-472c-9689-9d3877d31084",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "def plot_conf_interval(title, list, interval):\n",
+    "    fig, ax = plt.subplots(figsize = (6, 4))\n",
+    "    ax.hist(list, bins = 10, color = \"royalblue\", edgecolor = \"black\")\n",
+    "    ax.set_title(f\"Oboustranný 95% interval pro skupinu \\\"{title}\\\"\")\n",
+    "    ax.axvline(x = interval[0], color = \"red\")\n",
+    "    ax.axvline(x = interval[1], color = \"red\")\n",
+    "    plt.show()"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "b5fd12a4-8517-4c5e-9f18-eaf627c56afa",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "conf_survived = conf_interval(survived, \"survived\")\n",
+    "conf_perished = conf_interval(perished, \"perished\")"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "f17915e9-aef8-430d-8096-c13f078e25eb",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "plot_conf_interval(\"survived\", survived, conf_survived)\n",
+    "plot_conf_interval(\"perished\", perished, conf_perished)"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "1c7cf77b",