Problem 2 (10 points): Identify the population and the sample. 1) A survey of 1000 U.S. adults found that 83% think credit cards tempt people to buy things they cannot afford. 2) Thirty-eight nurses working in the San Francisco area were surveyed concerning their opinions of managed health care. 3) In a study investigating the effectiveness of a new teaching method on student performance in a large urban school district, researchers randomly selected five schools from the district. From each selected school, two classes were chosen, and all students within those classes were included in the study. The study measured the students academic performance in mathematics before and after implementing the new teaching method. 4) A survey of 1205 physicians found that about 60% had considered leaving the practice of medicine because they were discouraged over the state of U.S. health care. 5) In a civil engineering firm, a study is conducted to assess the effectiveness of a new project management software in improving project efficiency. The firm operates in multiple regions and manages various types of projects, including infrastructure development, urban planning, and environmental engineering. For the study, the firm selects five representative project teams from different regions and provides them with training on the new software. After six months of implementation, data is collected on project completion times, resource utilization, and client satisfaction for each team.