Fixed a broken link to homework 8 and added practice 8

hw/hw08/hw08.ipynb

@@ -318,7 +318,7 @@
     "2. Fail to reject the null\n",
     "3. Unable to tell using our staff confidence interval\n",
     "\n",
-    "*Hint:* If you're confused, take a look at [this chapter](https://www.inferentialthinking.com/chapters/13/4/using-confidence-intervals.html) of the textbook."
+    "*Hint:* If you're confused, take a look at [this chapter](https://inferentialthinking.com/chapters/13/4/Using_Confidence_Intervals.html) of the textbook."
    ]
   },
   {

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