Chapter 9 defines intelligence and IQ testing. The chapter mostly discusses how to calculate IQ, the reliability of it, and the influences on IQ (such as genetics and sex). The most interesting thing that stood out to me was how there is no strong evidence to show that coaching on college admission tests gives students greater results. There is a positive correlation, however it may not be because of the teaching, but because of the "practice effect" (frequency improve on tests as a result of practice). There are countless programs that offer coaching on college admission tests, and many students at the university most likely had some sort of training before they took the ACT/SAT. The teaching/training for these tests can be very costly. There is a lot of pressure to well on these exams since they may make or break ones college admission; however, I had hoped that there would be more evidence that these programs are helping students more than they are.