Merge pull request bcaffo#54 from Radcliffe/master

minus sign should be in math mode

06_StatisticalInference/homework/hw1.Rmd

@@ -123,7 +123,7 @@ what is the variance $\bar X - \bar Y$?
 
 1. 0
 2. _$2\sigma^2/n$_
-3. $\mu_x$ - $\mu_y$
+3. $\mu_x - \mu_y$
 4. $2\sigma^2$
 
 *** .hint

06_StatisticalInference/homework/hw2.Rmd

@@ -148,7 +148,7 @@ You don't believe that your friend can discern good wine from cheap. Assuming
 that you're right, in a blind test where you randomize 6 paired varieties (Merlot,
 Chianti, ...) of cheap and expensive wines
 
-what is the change that she gets 5 or 6 right expressed as a percentage
+1. what is the change that she gets 5 or 6 right expressed as a percentage
 to one decimal place?
 
 *** .hint
@@ -168,7 +168,7 @@ Consider a uniform distribution. If we were to sample 100 draws from a
 a uniform distribution (which has mean 0.5, and variance 1/12) and take their
 mean, $\bar X$
 
-what is the approximate probability of getting as large as 0.51 or larger expressed to 3 decimal places?
+1. what is the approximate probability of getting as large as 0.51 or larger expressed to 3 decimal places?
 
 *** .hint
 Use the central limit theorem that says $\bar X \sim N(\mu, \sigma^2/n)$
@@ -219,7 +219,8 @@ mean((1 : 6 - 3.5)^2 / 10)
 
 --- &multitext
 The number of web hits to a site is Poisson with mean 16.5 per day. 
-What is the probability of getting 20 or fewer in 2 days expressed
+
+1. What is the probability of getting 20 or fewer in 2 days expressed
 as a percentage to one decimal place?
 
 *** .hint