Through understanding of the theory of the experiment, and of appropriate experimental techniques. Methodical approach. Care in measuring, including calibration of measuring-instruments when necessary. Repeatability - possibly many times if obtaining precise measurements is difficult, with those difficulties identified and understood. Careful analysis of the results to identify any misleading values.
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essential attributes of linear programming models and its uses
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.
good conductor
If you documented all your results, had a partner, had a witness, completed the experiment many times with the same results, and tested the experiment on the proper things then this would be good validation.
A controlled variable means that it stays the same while other substances change. This helps prove the exact changes in an experiment.