According to the ________, the difference between highly skilled and expert levels of performance can be a matter of a few thousand hours of practice

Growth and development in infancy proceeds from the head downward, which is known as the ____

a. head first, body second principle b. cephalocaudal principle c. proximodistal principle d. top-down principle

Assume a normal distribution of height scores, with a mean of 68" and a

standard deviation of 3", then a. 68% of the cases must fall between 65" and 71" b. 50% of the cases must fall below 68" c. 68% of the cases must fall at exactly 68" d. a and b, but not c