Which of the following threats to internal validity would be of concern if an outbreak of salmonella in peanut butter occurred while a study was being conducted on perceptions of peanut butter?

If a country prevents attacks against itself or its allies through the threat of massive retaliation, that country is said to be practicing

a. deterrenc e. b. containment. c. isolationism. d. détent e. e. democratic peac e.

Which of the following programs has had the greatest impact on decreasing inequality in the United States?

a. Social Security b. Medicaid c. Food Stamps d. Medicare