William and Danielle, both professionals, have higher levels of sexual satisfaction and pleasure than most of their friends. They often go for candlelight dinners and hand-in-hand walks. They are committed to learning each other's likes and dislikes and are sensitive to each other's needs. They also provide emotional and financial stability to one another. In this scenario, William and Danielle are most likely to be .

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: