Look at the research matrix below without column headings. What type of design does this research matrix represent?

All acts of lethal violence among humans can be seen as acts of aggression

a. True b. False

The attitudes of Americans toward politicians

a. are increasingly positive as the government has reduced the differences in wealth and well-being among individuals and groups. b. have improved slightly in recent years as politicians rediscovered the value of bargaining and compromise to break political gridlock. c. are increasingly negative because public distrust of government has deepened markedly as Americans believe that public officials are corrupt and government wastes taxpayers’ money. d. have remained stable in recent years because there is no reason to expect any significant changes in public attitudes toward government.