Annie is studying how reaction time is related to age group. She wants to compare younger adulthood (18–24), middle adulthood (40–46), and older adulthood (74–80), so she tests the reaction times of 20 people in each age group on a video game task. What type of research design is Annie using?

In Chase & Simon's research on memory for chess positions, after one look at a

board from a real game, the Master player recalled about ______ pieces as the Class A player. (a) the same number of (b) twice as many (c) twenty four times as many; the Master recalled all of them; the Class A player just one (d) that study did not use boards from a real game

Hearing begins when sound waves bump against the ______

a. earlobe b. eardrum c. oval window d. round window