[WIP] Restructure nb3 onwards (#76)

* move arviz to conda

* moved notebooks to extra-practice

Author: ericmjl

notebooks/04-instructor-multi-group-comparsion-sterilization.ipynb renamed to notebooks/extra-practice-instructor-multi-group-comparsion-sterilization.ipynb

@@ -32,14 +32,24 @@
     "\n",
     "It is intentionally designed to provide more guidance w.r.t. model definition, i.e. which parameters to use, such that the focus is more on PyMC3 syntax rather than the mechanics of model definition. \n",
     "\n",
-    "If you are already feeling comfortable with PyMC3 syntax, and would like to instead move on to practice with model definition, then feel free to move onto notebook 5 instead, where you can play with the Darwin's Finches dataset. That notebook is intentionally designed with much more freedom.\n",
-    "\n",
+    "If you are already feeling comfortable with PyMC3 syntax, and would like to instead move on to practice with model definition, then feel free to move onto notebook 5 instead, where you can play with the Darwin's Finches dataset. That notebook is intentionally designed with much more freedom."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "## Setup\n",
     "\n",
     "You will be experimentally analyzing the effectiveness of six different phone sterilization methods against two control methods. This research was conducted at MIT's Division of Comparative Medicine, and was published this year in the Journal of the American Association for Laboratory Animal Science. If you're interested, you can read the paper [here][jaalas].\n",
     "\n",
-    "[jaalas]: https://www.ncbi.nlm.nih.gov/pubmed/29402348\n",
-    "\n",
+    "[jaalas]: https://www.ncbi.nlm.nih.gov/pubmed/29402348"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "### Experiment Design\n",
     "\n",
     "Briefly, the experiments were setup as such.\n",
@@ -61,8 +71,13 @@
     "    x & \\text{otherwise}\n",
     "    \\end{cases}$$\n",
     "\n",
-    "Sometimes, due to experimental variation, there are more colonies post-sterilization than pre-sterilization. This may occur particularly when the number of colonies counted on a plate is low (e.g. countable on our fingers). Thus, clipping the values helps us avoid negative percentage reductions, which one might consider to be be an \"absurd\" scenario to be in.\n",
-    "\n",
+    "Sometimes, due to experimental variation, there are more colonies post-sterilization than pre-sterilization. This may occur particularly when the number of colonies counted on a plate is low (e.g. countable on our fingers). Thus, clipping the values helps us avoid negative percentage reductions, which one might consider to be be an \"absurd\" scenario to be in."
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "### Data\n",
     "\n",
     "The data for this notebook came from [Evaluation of 6 Methods for Aerobic Bacterial Sanitization of Smartphones](https://www.ncbi.nlm.nih.gov/pubmed/29402348)."

notebooks/03-instructor-two-group-iq.ipynb renamed to notebooks/extra-practice-instructor-two-group-iq.ipynb

@@ -2,9 +2,17 @@
  "cells": [
   {
    "cell_type": "code",
-   "execution_count": null,
-   "metadata": {},
-   "outputs": [],
+   "execution_count": 1,
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stderr",
+     "output_type": "stream",
+     "text": [
+      "WARNING (theano.tensor.blas): Using NumPy C-API based implementation for BLAS functions.\n"
+     ]
+    }
+   ],
    "source": [
     "import pandas as pd\n",
     "import numpy as np\n",