Answer:
Self-interest study
Explanation:
Here, it is in the best interest of the dairy farmer's organization that the fact that eating 4 servings of dairy a day will lower osteoporosis rates in people. There is a bias in the research even though the research does not highlight this fact. Proving the above hypothesis may mean a higher number of sales for the dairy organization.
This research is being done because of the self interest of the dairy organization so it is a Self-interest study.
