In an Experimental investigation you are trying to answer one question. While in a descriptive investigation you are trying to describe something and comparative you are comparing one thing to another.
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comparative data analysis is when you compare your data or results. there is 2 more types of scientific investigations, descriptive investigation and experimental investigation.
comparing means the word itself "compare" compare means you put two or more objects and you see the differences and observe them.
You establish a controlled variable from which you can compare your results from your experimental variables.
Comparative is when u are comparing two things and some key words are compare and contrast where as experimental is when a fair test is designed and u are changing many things but only one at a time
Experimental data is an important component of any scientific paper.After looking at the data, we can compare that to our hypothesis and see if it matches to our tentative idea.Analysis of experimental data also helps us to draw a conclusion of an experiment.