If an iq test has high predictive validity, then
a. a psychologist can accurately guess what score someone will get before he or she has started the test.
b. students who get good score on the test will get even better scores if they take the test again
c. The mean and dtandard deviation on the test are equal for all groups of people
d.students who do well on the test also get good grades in school
I'll be glad to check your answer.
I think your teacher is under the gross mistaken belief that IQ and grades in school are related. Answers a,b, c are silly, and answer d) is mistaken. But I bet your teacher thinks it is correct.
http://en.wikipedia.org/wiki/Predictive_validity
To determine which option is correct, we need to understand what "predictive validity" means in the context of an IQ test.
Predictive validity refers to the ability of a test to accurately predict future performance or behavior. In the case of an IQ test, a high predictive validity would mean that the test can effectively predict an individual's intellectual abilities and their potential for success in various settings.
Let's evaluate each option based on the concept of predictive validity:
a. A psychologist can accurately guess what score someone will get before he or she has started the test.
This option suggests that a psychologist can predict the test score without the person actually taking the test. This is not likely to be true since IQ tests are designed to measure an individual's cognitive abilities and require actual test performance rather than a mere guess. Therefore, option (a) is unlikely to be correct.
b. Students who get a good score on the test will get even better scores if they take the test again.
This option implies that an individual's test scores will consistently improve if they retake the IQ test. However, predictive validity does not necessarily guarantee improvement in test scores upon repeated testing. It primarily focuses on the relationship between IQ test scores and future performance, not improvement in scores over time. Therefore, option (b) is not the best choice either.
c. The mean and standard deviation on the test are equal for all groups of people.
This option focuses on the statistical properties of the IQ test scores among different groups of people. Predictive validity, however, doesn't directly relate to the mean and standard deviation of the test scores among different groups. So, option (c) is not likely to be correct.
d. Students who do well on the test also get good grades in school.
This option suggests that there is a link between high IQ test scores and good academic performance in school. Since predictive validity examines the relationship between test scores and future performance, and academic grades are a common measure of performance, option (d) is the most suitable choice.
Therefore, the correct answer is (d). Students who perform well on the IQ test are likely to achieve good grades in school as a result of the high predictive validity of the test.