Which of the following agreements established free trade among the United States, Canada, and Mexico?

One reason that counties along the border with Mexico have some of the highest poverty rates in the country is that they have large Hispanic populations

Indicate whether this statement is true or false.

An advantage of doing experiments in the laboratory over the field setting is that

a. participants can be randomly assigned in the lab. b. more extraneous variables can be held constant in the lab. c. variables can be manipulated in the lab. d. there is no selection bias in the lab.