Merge pull request swirldev#181 from canuzun/patch-1

typo fixed. } was used instead of )

Statistical_Inference/T_Confidence_Intervals/lesson

@@ -49,7 +49,7 @@
   Output: As df increases, the t distribution gets more like a standard normal, so it's centered around 0. Also, the t assumes that the underlying data are iid Gaussian so the statistic (X' - mu)/(s/sqrt(n)) has n-1 degrees of freedom. 
 
 - Class: mult_question
-  Output: Quick check. In the formula t=(X' - mu}/(s/sqrt(n)), if we replaced s by sigma the statistic t would be what asymptotically?.
+  Output: Quick check. In the formula t=(X' - mu)/(s/sqrt(n)), if we replaced s by sigma the statistic t would be what asymptotically?.
   AnswerChoices: the standard normal; the standard abnormal; the population variance; Huh?
   CorrectAnswer: the standard normal
   AnswerTests: omnitest(correctVal='the standard normal')