1. A system for managing confidence data in a question-answering environment, the system comprising: a processor; and a computer readable storage medium having program instructions embodied therewith, the program instructions executable by the processor to cause the system to: sort, based on a set of answer categories for a subject matter, a first set of a plurality of answers into a first answer category and a second set of the plurality of answers into a second answer category, each of the first set corresponding to at least one of a third set of a plurality of confidence scores and each of the second set corresponding to at least one of a fourth set of the plurality of confidence scores, the plurality of confidence scores representing confidence of answers to a query submitted to a question-answering system; classify confidence scores of the third set into one of a plurality of confidence buckets using a first threshold; determine a fifth set of a plurality of thresholds using the plurality of confidence scores; and classify unclassified confidence scores of the third set into one of the plurality of confidence buckets using the fifth set of the plurality of thresholds.