In 2012, about ________ of 6- to 11-year children were overweight

An example of a longitudinal study of drug use would be

A. surveying high-school seniors every year. B. following each individual throughout the entire day. C. sampling drug use from different parts of the country. D. following the same group of people at intervals over several months or years.

In comparison to how well a group of young adults performs, a group of older adults would likely perform LEAST well on which of the following tasks?

a. typing quickly and accurately b. spelling c. recalling historical facts, such as the names of the first 4 presidents of the U. S. d. reading for meaning