Answer:
Observational Research Design
Step-by-step explanation:
For determining the relation between the color of the walls and employee absenteeism, observational research design will be the right option. This research strategy aims to reach a conclusion by making a comparison between subjects against a control group. There are two general types of observational designs. Observational research method helps discover what variables may be important before going in to apply other methods like experiments. This research design helps elicit a significant insight into a phenomenon or practice and the researcher will be able to gather the depth of information about a particular behavior. Since observational study is flexible it tends to avoid the practical or ethical problems of going in for a large research project, and even can be generalized.