a. Define the main facts to be analyzed. (Hint: These facts become the source for the design of the fact table.) The main facts are the total number of students by time, the major, the semester, and the student classification. b. Define and describe the possible dimensions. (Hint: These dimensions become the source for the design of the dimension tables.) c. Draw the lab usage star schema, using the fact and dimension structures you defined in Problems 1a and 1b.