This is because we hoped that our trial subjects would prefer Sent-Hybrid to Sent-Pred, as the former is designed to better tailor a response to a request.
we cannot determine from this result whether indeed there is no difference between the sentencebased methods, or whether such a difference simply could not be observed from our test sample of at most 80 cases, which constitutes 1.8% of the corpus used in our automatic evaluation (as indicated previously, it would be quite difficult to conduct user studies with a much larger data set).