The correct answer is: All of these.
Experimental research is a type of research that involves manipulating one or more variables to observe the effect on another variable. Historical research is a type of research that involves studying the past.
The main difference between experimental research and historical research is that experimental research can be used to test hypotheses, while historical research cannot. This is because experimental research allows researchers to control the variables that they are studying, while historical research does not.
In experimental research, the researcher formulates a hypothesis, which is a statement about the relationship between two or more variables. The researcher then designs an experiment to test the hypothesis. The experiment involves manipulating one or more variables, called the independent variables, and observing the effect on another variable, called the dependent variable. The researcher then collects data and analyzes it to see if the results support the hypothesis.
In historical research, the researcher does not have the ability to manipulate variables. Instead, the researcher must rely on secondary sources, such as documents, artifacts, and interviews, to study the past. The researcher then interprets the data to draw conclusions about the past.
Historical research can be used to answer questions about the past, but it cannot be used to test hypotheses. This is because historical research is not based on controlled experiments.
In conclusion, the main difference between experimental research and historical research is that experimental research can be used to test hypotheses, while historical research cannot. This is because experimental research allows researchers to control the variables that they are studying, while historical research does not.