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.
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Experimental data. Information about what conditions are present when measured or observed.
The word empirical denotes information gained by means of observation, experience, or experiment.
The scientific method does not detail how you do an experiment, only the method used in general terms.
The data collected does not have to be measurable.