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It is easier to determine precision because all you need are your measurements or data and no knowledge of whether your data are a true representation of whatever phenomenon you are studying. For example, suppose you wish to measure the boiling point of a liquid, so you heat the liquid slowly and record at what temperature the liquid begins boiling. You do this several times and record boiling points of 76.5, 76.2, 76.3 and 76.3 degrees. The data seem very precise meaning the values are close together and reproducible. If your thermometer is off by 5 degrees, however, your data are completely inaccurate, but you would have no way of knowing this. To determine the accuracy of your data you would need to measure the boiling point by several different methods, for example using an electronic thermometer or simultaneously heating with the same heating apparatus a substance with a known boiling point for comparison.

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15y ago

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