The United States has diplomatic relations with only a handful of industrialized countries

The classification of a variable (e.g., independent vs. dependent) depends on

A) the characteristics of the variable alone. B) the nature of the study alone. C) the characteristics of the variable and the nature of the study. D) the biases of the researcher.

What factors contributed to the rise of the suburbs?

a. Tax policy allowing homeowners to deduct mortgage interest from their income tax liability b. The interstate highway system c. The migration of jobs to the suburbs d. All of the above