Merge pull request DataScienceSpecialization#31 from Entodi/master

Fixed expression to Variance.

Author: bcaffo

06_StatisticalInference/homework/hw1.Rmd

@@ -179,7 +179,7 @@ What is the variance expressed to 1 decimal place?
 4. 17.0
 
 *** .hint
-The variance is $E[X^2] - E[X^2]$
+The variance is $E[X^2] - E[X]^2$
 
 *** .explanation 
 ```{r}

06_StatisticalInference/homework/hw1.html

@@ -333,7 +333,7 @@ <h2>About these slides</h2>
   <button class="quiz-clear btn btn-danger">Clear</button>
 
   <div class="quiz-hint">
-  <p>The variance is \(E[X^2] - E[X^2]\)</p>
+  <p>The variance is \(E[X^2] - E[X]^2\)</p>
 
 </div>
 <div class="quiz-explanation">
@@ -447,4 +447,4 @@ <h2>About these slides</h2>
   <script>hljs.initHighlightingOnLoad();</script>
   <!-- DONE LOADING HIGHLIGHTER JS FILES -->
 
-  </html>
+  </html>

06_StatisticalInference/homework/hw1.md

@@ -185,7 +185,7 @@ What is the variance expressed to 1 decimal place?
 4. 17.0
 
 *** .hint
-The variance is $E[X^2] - E[X^2]$
+The variance is $E[X^2] - E[X]^2$
 
 *** .explanation