Measurement

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Absolute Error

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A measurement of the difference between a measured value and its true value.

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Accuracy

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A set of different values which are close to a true value. When measuring with a tool, the tool is accurate to 1/2 of the smallest measuring unit. (a group of darts near the target)

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Dimensional Analysis / Unit Analysis

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English system / Imperial system

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A system of measurement used in the United States using units such as feet, pounds and ounces.

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Error (in measurement)

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Error is a numerical value that tells us how far 'off' a measurement is compared to the correct or accepted value.

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Precision

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A set of different values which are close to one another. (a group of darts near one another)

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Proportion

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A statement that two ratios are equivalent.

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Relative Error / Percent Error

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A proportion of how large the absolute error is to the true value.

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The Metric System

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A standard system of measurement based on powers of 10. (meters, liters, grams)

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Tolerance

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