At Valley Forge, the Continental Army A. defeated British troops and managed to steal their supplies. B. worked on new military formations and received ammunition. C. found out British military plans and launched a surprise attack. D. suffered because of harsh weather conditions and a lack of supplies.

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: