CvThe Marshall Plan was created to help contain the spread of communism by .
A.
offering money to help rebuild post-World War II Europe
B.
offering money to help build the Panama Canal
C.
threatening trade sanctions against communist governments
D.
threatening war against communist governments

Dr. robbins wants to know if there are different opinions regarding the value of public school education between native americans who have at least one relative who attended indian boarding school and native americans who have no family experience with indian boarding school. dr. robbins contacts 35 native american participants in each group. he wants each group to include younger as well as older adults, and a mix of male and female participants. he asks each person to complete a survey about their attitudes toward public education. the design of this study is: