In a significant number of countries, spanking is illegal.

Researchers used a flip of the coin to assign participants to view either a one-minute public information video about the environment or a control video of the same duration that showed only highlights of entertainment news. The researchers then observed how many participants in each group deposited small water bottles (which they had been given at the outset) into the recycle bin as opposed to an adjacent trash bin. This research involves a(n)

a. Observational study b. Randomized experiment c. Quasi-experiment d. Natural experiment

Why did Arab states decide to cut off oil exports to the United States in 1973?

A. to punish the United States for its support of Israel during an Arab-Israeli war B. to achieve a better bargaining position on other trade issues C. to demonstrate their power in order to gain leverage over other states that import oil D. to increase the price of oil to match its value in the world economy