According to the text, the best single indicator of a state's power may be the size of its __________

What is the role of the National Security Council?

a. to advise the president on military affairs and foreign policy b. to keep the president and first family secure c. to administer the armed forces d. to provide the president with national security policy advice from the opposing party's perspective

If the direction of the relationship between the independent variable and the dependent variable is not constant at all values of the control variable it means the relationship is ___________________.

a. Interactive b. Spuriousness c. Additive d. Non-existent