Answer :
If a person scores a 70 on an intelligence test on one day and scores 110 when retested on a new day, you might determine that this test is unreliable. Reliability is a test for first requisite and refers to its steadiness: A reliable test is one that produces reliable scores when an individual takes two substitute methods of the test or when he or she proceeds the similar test on two or added dissimilar instances. If a person marks 70 on an intellectual test on a monday and 110 when retested on tuesday, you probably would not have much trust in the test.