harru, I'd be very skeptical about the validity of any so-called I.Q. test that you find on the internet. These tests may be fun to take, but I wouldn't put much faith in the scores, at all.
The most "accurate" intelligence tests are those that are individually administered and scored by a psychologist. Since you must take these tests in person, the results cannot be duplicated by anything you would find on the internet.
Group tests, which are the only types of tests you can find on the internet, are tests which can be given to large groups of people, they are self-administered (you read the questions by yourself and respond without an examiner present) and generally are automatically scored by the Web site. These really should not be considered as meaninfgul tests of intelligence. The best of these tests might be screening devices to give you some idea of your aptitude when compared to other people who might take this test. However, the validity of these tests is open to serious questions. How do you know this test is actually measuring what it claims to be measuring?
The business of test construction is quite complicated, and if a test cannot demonstrate that it measures what it purports to measure, it is of no value at all. Abilities and aptitudes can also be heavily influenced by cultural factors--a test constructed to measure something in one group of people may not yield similar results when given to a different cultural group. Group tests, of a type found on the internet, cannot control for these cultural factors because there is no way of establishing the identity of those taking the test. You may also know next to nothing about the qualifications of the person who constructed the test, or how it was standardized.
Any group test you find on the internet, claiming to measure intelligence or I.Q., should be taken only for fun or entertainment value--and do not place too much importance on the scores, because they are not likely telling you very much, and they may bear little relationship to an I.Q. score you might get on an intelligence test individually administered and scored by a psychologist.
well, i copied an iq test questions from the internet. if a let a man answer it and took a 30 item test and scored 20 out of 30 within 30 minutes with an age of 17 and a test mean of 15, how can i turn the score into the numbers in the scale?
Based on that info, I can't answer your question. You have the mean score, but not the standard deviation from the mean. Just knowing that a score of 20 is 5 points over the mean really doesn't tell you much, other than that your score is allegedly above the mean, or average, on that particular test.
You cannot get a valid Mental Age or I.Q. score from this type of test--a score that would be comparable to that obtained from the Stanford-Binet or Wechsler tests of intelligence.
But, the Web site where you found the test questions should provide you with the info to find out what that your "score" is on this particular test, and how it might compare to others who take this particular test. As I said, regard this info with a grain of salt and a great deal of skepticism.
If you post a link to the site where you obtained the questions, I'll see if I can help you figure out your score, or range, on that particular test.