It's quick but it will do for now.

lang/en/help/quiz/questiondatasets.html

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 <P ALIGN=CENTER><B>Question datasets</B></P>
 
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+<p>A dataset is a collection of data used to create a question
+   (such as a calculated question), where it is inserted in 
+   place of a variable within the question.</p>
+
+<p>You can create a "<i>private</i>" dataset for a specific question,
+   or a "<i>reusable</i>" dataset that can be used within all
+   questions within a category.</p>
+ 
+<p>When creating a question that uses datasets, you'll be prompted 
+   with two screens.  
+
+<p>The first screen allows you to assign a particular dataset to be 
+   substituted for each variable.</p>
+
+<p>The second screen allows you to add and remove sets of numbers in
+   the dataset.  The numbers used for individual questions presented
+   to students will be selected from this set.</p>
+
+