Instead of manipulating variables, the researcher measures the extent to which changes in one variable are accompanied by changes in a second variable. What type of study is this?

When a child can figure out that 4 + 7 is 11 by first adding 4 + 6 and then adding one, he or she is using

A) a counting strategy. B) subitizing. C) phonemic awareness. D) practical intelligence.

What is one of the major cultural reasons that there are differences in rates of death from heart disease among ethnic groups in the United States?

a. diet b. exercise c. sedentary employment d. lack of health insurance