Question 1: What information is already present about the topic? And how will this study support, challenge or refute the existing information?
Question 2. What information will the reader know based on this study?
Question 3. What gaps in the existing literature will this study fill?
Question 4. Why is this study/research important and will the research/study improve or revolutionize the field of study?
In answering these questions the reader will be able to justify the purpose of the study. References if use please.
Reference:
Hernon, P., & Schwartz, C. (2007). What is a problem statement? Library & Information Science Research, 29(3), 307-309