Experimental study involves some form action, imposed control or intervention to obtain data for subsequent analysis while Empirical study involves purely the observation and analysis of data.
What we see the breakthroughs of theories mostly tested empirically means the theory would be tested by the data for a certain time for example Leontif paradox which is the empirical test of H-O theory. I hope It would help you to understand.
Case study usually means qualitative research, for example you
analyze one or few companies. Emprical research is usually of quantitative nature and requires a representative and reliable sample which size depends on the total population. In general, you can't do much of usual statistics if your sample is less than 100 in business sfudies.
The case study is defined as a way to study a particular unit such as a local community, family, tribe, industrial establishment or service in a detailed and detailed study with a view to fulfilling all its aspects and coming out with generalizations applicable to similar cases.
The curriculum aims to pay attention to the overall position, including the molecules
Definition of the experimental approach :
Experimental research is the research that uses the experiment to examine and test a particular hypothesis, determines the relationship between two variables or factors, by studying the opposite attitudes that caught all the variables except the variable that the researcher is interested in studying its impact.
Any attempt to control all the fundamental factors affecting the dependent variable except for one factor controlled by the researcher and changed in a certain way to determine and measure its impact on the dependent variable .
The empirical method is the most accurate research method, and the experimental method is concerned with collecting data to test hypotheses related to a specific issue with isolating or stabilizing the other factors that can have an effect on the result, ie the experimental method seeks to reveal the relationships between variables in conditions controlled by variables To determine the conditions that cause a specific phenomenon, so experimentation is a deliberate and specific change to the specific conditions of an event and the observation of the resulting changes in the event itself