Repeatability
Good repeatability may suggest you have a good result, but if you think that you have discovered a new phenomenon, make sure other scientists reproduce the same observations with their equipment!
There are many factors that can cause inaccuracy:
- environmental
- inferior measuring equipment
- poor measuring techniques
Even when you are precise and accurate there will always be some uncertainty in your measurements.
You can improve accuracy by calibrating your instruments against a standard reference to find errors in the instrumental reading.
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