ans = 0.2222 ans = 0.5556 ans = 0.6667 ans =-0.6667 Accuracy, Precision, and Errors Accuracy is a measure of the nearness of a value to the correct or true value. Precision refers to the repeatability of a measurement, this how close successive measurements are to each other. Errors: All measurements will have some degree of error. IdentiFable and correctable errors are called systematic . Accidental or other nonidentiFable errors are called random . Systematic Errors: Some errors will always have the same sign (+ or − ) and are said to be systematic. Consider measure the distance between two points with a 25m steel tape. ±irst, if the tape is not exactly 25.000m long, compared with the standard at the U.S. Bureau of Standards, there will be a systematic error. However, this error could be removed by applying a correction. A second source of error can be due to the temperature at the time of use and at the time when the tape was compared with the standard. A mathematical correction can be applied if this
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ambient air temperature, 25m, 25.000m, U.S. Bureau of Standards