Five to 10 percent of school-age children have

Taci finds a correlation between a manual dexterity test and performance of .30. She squares this value and obtains a value of .09. This value of .09 represents the:

A) performance coefficient. B) validity coefficient. C) coefficient of determination. D) coefficient of agreement.

A child wants a toy that is too big to be pulled straight through the bars of her crib. She studies the toy for some time and then grabs it, turns it sideways, and fits it through the bars. This child is using

a. primary circular reaction. b. invention of new means through mental combinations. c. secondary circular reactions. d. coordination of secondary schemes.