A piece of evidence that would be considered the most reliable and valid will be data collected from a controlled experiment that has been reproduced in several different labs.
Reliability of results
In scientific research, the reliability of results is improved if the result is reproducible by independent researchers under similar conditions.
Results that are not reproducible are not reliable and may not be accepted as evidence to support hypotheses or theories in science.
Thus, irrespective of who collected the data, reproducibility is a key attribute of reliable and valid data.
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