Fixes minor grammar error

Chapter2_MorePyMC/MorePyMC.ipynb

@@ -1161,7 +1161,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "Suppose 100 students are being surveyed for cheating, and we wish to find $p$, the proportion of cheaters. There a few ways we can model this in PyMC. I'll demonstrate the most explicit way, and later show a simplified version. Both versions arrive at the same inference. In our data-generation model, we sample $p$, the true proportion of cheaters, from a prior. Since we are quite ignorant about $p$, we will assign it a $\\text{Uniform}(0,1)$ prior."
+      "Suppose 100 students are being surveyed for cheating, and we wish to find $p$, the proportion of cheaters. There are a few ways we can model this in PyMC. I'll demonstrate the most explicit way, and later show a simplified version. Both versions arrive at the same inference. In our data-generation model, we sample $p$, the true proportion of cheaters, from a prior. Since we are quite ignorant about $p$, we will assign it a $\\text{Uniform}(0,1)$ prior."
      ]
     },
     {
@@ -2586,4 +2586,4 @@
    "metadata": {}
   }
  ]
-}
+}