Corrected a misspelled word

15_hierarchical_modelling.ipynb

@@ -13,7 +13,7 @@
     "Epidemiological data is often complex, and we need to have appropriate tools to model complexity.\n",
     "\n",
     "`````{admonition} Group Task\n",
-    "Discuss with your neighbours how exactly the assumption of indendepdent errors $\\epsilon_i$ in linear regression \n",
+    "Discuss with your neighbours how exactly the assumption of independent errors $\\epsilon_i$ in linear regression \n",
     "\n",
     "$$y_i = X_i \\beta + \\epsilon_i,\\\\\n",
     "\\epsilon_i \\sim \\mathcal{N}(0, \\sigma^2)$$ \n",