Merge pull request #182 from mujisashi/mujifix-chap13-2

Minor typo fixes - chapter 13, section 2 "Bootstrap"

chapters/13/2/Bootstrap.ipynb

@@ -632,7 +632,7 @@
    "source": [
     "## Bootstrap Empirical Distribution of the Sample Median\n",
     "\n",
-    "We can now repeat the bootstrap process multiple times by running a `for` loop as usual. In each iteration, we will call the function `one_bootstrap_median` to generate one value of the bootstrapped median based on our original sample `our_sample`. Then we will append the boostrapped median to the collection array `bstrap_medians`.\n",
+    "We can now repeat the bootstrap process multiple times by running a `for` loop as usual. In each iteration, we will call the function `one_bootstrap_median` to generate one value of the bootstrapped median based on our original sample `our_sample`. Then we will append the bootstrapped median to the collection array `bstrap_medians`.\n",
     "\n",
     "Since we are asking for 5000 repetitions, the code might take a while to run. It has a lot of resampling to do!"
    ]
@@ -797,7 +797,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "We will start by writing a function `bootstrap_median` that takes two arguments: the name of the table containing the original random sample, and the number of bootstrap samples to draw. It returns an array of bootstrapped medians, one from each boostrap sample."
+    "We will start by writing a function `bootstrap_median` that takes two arguments: the name of the table containing the original random sample, and the number of bootstrap samples to draw. It returns an array of bootstrapped medians, one from each bootstrap sample."
    ]
   },
   {