Problem:
My operates a chain of 35 family-style restaurants in California. The company is designing a marketing research plan to determine what items on its menu should be revised. The company intends to design a survey of its current customers, to conduct interviews with its suppliers to identify industry trends, and to start randomly monitoring sales for the current menu items at the restaurants. This sales information by menu item does not currently exist. What type of data is our restaurants using for its market research?