dentifying if the person has the capacity to develop more intellectually.Last but not least, it is important to notice the greatest discrepancies in both tests which is that the Ratio IQ consists of a specific group of questions, while the Deviation IQ consists of diverse subtests which range from mathematics to that of logical reasoning. These subtests will allow the tester to identify the areas of strengths and weaknesses of the individual.Standardization of testsAn intelligence test, like any other psychological test, must meet certain criteria in order to be accepted as scientific and accurate. A test must be standardized, reliable, and valid.Standardization refers to the process of defining norms of performance to which all test takers are compared. Before an intelligence test can be used to make meaningful comparisons, the test makers first give the test to a sample of the population representative of the individuals for whom the test is designed. This sample of people is called a normative sample, because it is used to establish norms (standards) of performance on the test. Normative samples usually consist of thousands of people from all areas of the country and all strata of society. Test scores of people in the sample are statistically analyzed to compile the test norms. When the test is made available for general use, these norms are used to determine a score for each person who takes the test. The IQ score or overall score reflects how well the person did compared to people of the same age in the normative sample.Reliability refers to the consistency of test scores. A reliable test yields the same or close to the same score for a person each time it is administered. In addition, alternate forms of the test should produce similar results. By these criteria, modern intelligence tests are highly reliable. In fact, intelligence tests are the most reliable of all psychological tests.Validity is the extent to which a test predict...
