A predictive correlational design would certainly allow us to investigate the relationship between the incentive variables and sales transaction variable, but what about assessing the differences between the two sized cities? Would that be an important factor to investigate since we have data collected from both small and medium-sized cities?

Could the purpose also be to explore the differences between the two cities? Which type of research design would you consider using if comparing the two sized cities? You might find the article by Frey (2018) helpful:-)

How are comparative and predictive research designs different?