True or False: Unlike the economic system of a country, the legal system is NOT influenced by the prevailing political system.

Without internal validity, an experimenter cannot

a. control extraneous variables. b. manipulate the independent variable(s). c. measure the dependent variable. d. make statements about cause and effect.

Nationally, what percentage of public education is funded by the federal government?

a. less than 1 percent b. approximately 7 percent c. 15 percent d. about 50 percent e. about 75 percent