Measurement Precision, Accuracy, and Error
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Measurement: Precision, Accuracy, and Error West Baton Rouge Parish Schools Grade 6 GLE 31 Precision in Measurement Precision Precision is how close the measured values are to each other. Accuracy in Measurement Accuracy Accuracy is how close a measured value is to the actual (true) value. Degree of Accuracy Accuracy depends on the instrument you are measuring with. But as a general rule: The degree of accuracy is half a unit each side of the unit of measure If your instrument If your instrument measures in "1"s then measures in "2"s any value between 6½ then any value and 7½ is between 7 and 9 is measured as "7" measured as "8" Error in Measurement encompasses both the imprecision of data and its inaccuracies High Accuracy… Low Precision High Precision … Low Accuracy If we measure the length of a foot-ruler and get values of 12.01 in, 12.00 in, 11.99 in, 12.00 in. These numbers are precise enough for us to believe that if we measure it again we would get 12.00+0.01 in. These measurements are precise but necessarily accurate. The foot-ruler may actually be metric ruler of 30.0 cm long. Our measurement is precise but not accurate.