Update student notebook

Author: canyon289

notebooks/03-student-two-group-iq.ipynb

@@ -288,7 +288,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Use `pm.plot_posterior()`\n",
+    "# Use `az.plot_posterior()`\n",
     "pm.__________________"
    ]
   },
@@ -377,7 +377,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "# Use `pm.plot_posterior`, but pass in different varnames\n",
+    "# Use `az.plot_posterior`, but pass in different varnames\n",
     "_______________________"
    ]
   },
@@ -489,7 +489,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "traces = az.traceplot(trace_alt)"
+    "traces = az.plot_trace(trace_alt)"
    ]
   },
   {