4. What are the three purposes of research? Write an essay to describe a research effort (or three different researches) in studying an issue (or three different issues) of public administration and what method it (or respectively they) can use to achieve each of the purposes. 5. Differentiate the terms with examples: face validity, criterion-related validity, construct validity, and content validity. 6. You are hired by the City Finance Department to conduct a citizen survey to identify budget priorities. The Department Director needs your advice about the ethical and political issues related to the survey. Please write a letter to inform the Director.