The office of lieutenant governor was vacated, and a special election was called to fill the office. When the head of the state’s Department of Education decided she might run for the office, she was unsure how running for this office could affect her long-term plans for running for the office of U.S. senator. She has hired a research company to obtain survey data from voters in the state. Given that she must make a decision in less than three weeks, the research company should use: