eremy, the manager at Orion Department Store, has noticed fluctuations in the sales of certain products after a change in the store layout. While certain products have shown an increase in sales, the sale of other products has declined considerably. Jeremy wants to make note of the areas of the store that customers frequent and those that they avoid. He hopes to gain sufficient insight in order to create a better store layout and get sales back to normal. In this scenario, Jeremy is most likely to use the method of $\_\_\_\_\_\_\_\_.$

projective technique

experimental research

observational research

mathematical modeling