Hi — Please look at this YouTube Video on how to construct a problem statement

Hi — Please look at this YouTube Video on how to construct a problem statement

Hi — Please look at this YouTube Video on how to construct a problem statement and respond to the following questions: Here the link. https://youtu.be/7dKmvkg6H8Y
Questions:
1. Why is a problem statement needed in research?

2. How many secondary sources should be included in a problem statement?

3. What makes a problem statement convincing?
Thanks.