__________ is the extent to which a test actually measures what it is supposed to measure
Validity. The extent to which a test measures what it is supposed to measure. All tests are designed to measure something; hopefully something specific. If the test does indeed measure what it is intended to measure, then we can say that the test is --------.plit-Half Reliability. A measure of consistency where a test is split in two and the scores for each half of the test is compared with one another. If the test is consistent it leads the experimenter to believe that it is most likely measuring the same thing.