6. The one or more memory devices of claim 5 , wherein determining that the user is engaging in a comparison task includes calculating a confidence interval that represents a likelihood that the user is engaging in a comparison task.
5. The one or more memory devices of claim 2 , wherein determining that the user is engaging in a comparison task further includes: associating the first entity with a first entity class; referencing an entity dictionary to identify that the entity dictionary includes a third entity associated with the first entity class, wherein the third entity is different than the first entity; and determining that the third entity had been extracted from a previous search query received from the user.