Answer:
Experimental.
Step-by-step explanation:
Experimental research according to research has many branches or forms it is seen to work on; here it is said to work with two variables, they can be seen to involve active manipulation of the independent variable, or intervention.
Enough data or research resource is know to support decisions made in the course of this research. Also, you must first determine the facts. Being tactful in your findings play vital roles in a persons research; thereby gathers the data necessary to help you make better decisions.
These form of research is known to be conducted under scientifically acceptable criteria and are expected to be of experimental forms and research modules.