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   "source": [
    "# E4. To be completed after lesson 13\n",
    "\n",
    "<hr />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 4.1\n",
    "\n",
    "Why are prior predictive checks useful and important?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br/>"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 4.2\n",
    "\n",
    "I contend that plotting the \"best fit line\" is not a sufficient graphical model assessment. I further contend that graphical posterior predictive checks are better. Do you agree? Why or why not?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 4.3\n",
    "\n",
    "If a model's posterior predictive checks check out, does it mean the model is a good generative model?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 4.4\n",
    "\n",
    "Write down any questions you may have."
   ]
  }
 ],
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