Salam Yap A. operates in the construction and marketing of HOUSING and BUSINESS in the provinces of our country, Istanbul, Ankara, zmir, Mersin, Antalya and Adana. Among the buildings built by this company, especially the sales of "smart residences", there has been a big decrease throughout the country since 2018. Marketing Managers cite the Economic Crisis as the main reason for this decline. The top management of the firm claims that there is a change in the income levels of the (target audience) that has the potential to purchase the constructed houses and that the decrease in sales is due to this change. In addition, they think that a new marketing strategy should be developed for the upper income group for existing and newly built houses. As a result of the meeting held by the Company's Board Members with Marketing Managers; It was decided to conduct a marketing research in order to determine whether there is a change in the income level of the customers who bought the houses they built. Since there is a 3-month time limit for the completion of this research, it was decided to commission the research at the Mirror Research Firm. As the manager of Mirror Research Firm:

1.a) Define the research problem.

b) Who are the main population of the research? From which groups of this population should the samples be taken?

2.Which sampling method / methods can be chosen as the Sampling Method, explain with justifications.

3. Write two basic hypotheses and two alternative hypotheses for your research.

4. Prepare a "Research Proposal" for this research.

5. Explain what kind of research model would be suitable for this research.