You need data to analyze the results of your experiment and to convince others that your conclusion is valid .
Example: What if I just now experimented on the effects of donuts and flying and concluded, "when I eat donuts, I can fly." I'm pretty sure you'd want to see some objective data to support my result.
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Gathering data is essential to any experiment. The data helps you comes up with results from your experiment so you can analyze them later for future studies. Without them, there would have been no point doing the experiment to begin with.
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Absolutely not. The procedure is petty much the experiment, the steps to perform the experiment. Data analysis you do after the procedure. This is pretty much looking at the results ( charts, graphs, data), that you recorded during the experiment.
Experimental data. Information about what conditions are present when measured or observed.