Precision and Accuracy - PrecisionandAccuracy

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Precision and Accuracy When we make a measurement in the laboratory we need to know how good it is. To this  end, we introduce two concepts:  Precision  and  Accuracy .   Precision  indicates degree of reproducibility of a measured number, and Accuracy  indicates how close your measurements are to the true value.  Let's look at throwing darts and trying to hit the bullseye as an illustration of these two  concepts. When you make measurements in science you want them to be both precise and accurate. Two students, Raffaella and Barbara, measured the temperature of boiling water, which by  definition should be 100°C under 1 atmosphere of pressure. Each student made 10  temperature measurements, shown below as red (Raffaella) and blue (Barbara) dots.
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The average of Raffaella's temperature measurements is 100.1°C and the average of 
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Precision and Accuracy - PrecisionandAccuracy

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