At tennis camp, Emma is capable of hitting tennis balls that come at her at high rates of speed. It takes Olivia longer to respond, and because of this, she sometimes misses the ball. The difference between Emma and Olivia is in their

Noted Greek philosophers such as Socrates, Plato, and Aristotle observed that

a. brain damage contributed to most mental disorders. b. emotions were caused by changes in brain chemistry. c. "truth" was determined by careful testing procedures. d. emotions can distort thinking. e. emotions were not worthy of scientific discussion.

Which of these is most commonly used as the reference point for an IQ test?

(a) the 75% point (b) the average score on the test (c) the correlation coefficient (d) the complete absence of intelligence (e) the highest score on the test, which is then curved