Dexterity scores Scores on a test of dexterity are recorded by timing a subject who is inverting pegs by picking them up with one hand, manipulating them to turn them over, and then placing them back in a frame. A typical 4-year-old needs about 3.125 seconds to invert a peg, but a 9-year-old takes 1.375 seconds and a 12-year-old can do it in 1.125 seconds. Plot these three points. Now try the reciprocal re-expression (1/y) vs. age. Which version is straighter? What interpretation would you give to the reciprocal?