Question: A test developer writes many items for a test to measure fear of heights. The items are then administrated to two groups of participants: people

A test developer writes many items for a test to measure fear of heights. The items are then administrated to two groups of participants: people attending a clinic treating height phobia and people attending a sky-diving school. The test developer compares the responses on each of the items on the test and retains the items that discriminate between people attending the clinic and people attending the sky diving school. This method of selecting is an example of

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