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There are many different things that are measured and tested by the data collected in an experiment. Color changes are one thing that can be measured and tested for example.
raw data
the answer is information
The word empirical denotes information gained by means of observation, experience, or experiment.
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.