minor fixes

simulations/lecture/simulations.tex

@@ -38,10 +38,9 @@ chapter~\ref{descriptivestatisticschapter}.
 For drawing numbers $x_i$ from a normal distribution we use the
 \code{randn()} function. This function returns normally distributed
 numbers $\xi_i$ with zero mean and unit standard deviation. For
-changing the standard deviation $\sigma$ we need to multiply the
-returned data values with the required standard deviation. For
-changing the mean we just add the desired mean $\mu$ to the random
-numbers:
+changing the standard deviation we need to multiply the returned data
+values with the required standard deviation $\sigma$. For changing the
+mean we just add the desired mean $\mu$ to the random numbers:
 \begin{equation}
   x_i = \sigma \xi_i + \mu
 \end{equation}