minor wordsmithing

Author: trevorcampbell

source/inference.md

@@ -256,9 +256,9 @@ expect our sample proportions from this population to vary for samples of size 4
 
 We again use the `sample` to take samples of size 40 from our
 population of Airbnb listings. But this time we use a list comprehension
-to repeat an operation multiple time (as in the previous chapter).
-In this case we are taking 20,000 samples of size 40
-and to make it clear which rows in the data frame come
+to repeat the operation multiple times (as in the {ref}`clustering` chapter);
+in this case we take 20,000 samples of size 40.
+To make it clear which rows in the data frame come
 which of the 20,000 samples,
 we also add a column called `replicate` with this information.