A45-year-old female is brought to the emergency department with a head injury after her car hit a tree. a few months after recovering from her injuries, she is unable to learn new information or recall previously learned information. she also exhibits an inability to recognize or identify at times household objects, as a spoon, and is often found eating with her fork. this symptom presentation is an example of:

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: