 Accuracy of a measurement: ◦ An indication of how close the measurement is to the accepted value ◦ Percentage difference can be calculated to give a.

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Presentation transcript:

 Accuracy of a measurement: ◦ An indication of how close the measurement is to the accepted value ◦ Percentage difference can be calculated to give a quantitative indication of a measurement’s accuracy—the smaller the percentage difference, the greater the accuracy ◦ Good accuracy is an indication of low systematic error.

 An indication of how “exactly” you can measure a piece of data  More precise measurements are those that are measured to a smaller increment of a unit of measure (i.e. more decimal places) ◦ Example: a thickness of wire measured with a meter stick will be precise to 0.01 cm; using a micrometer can increase the precision to cm  ALWAYS use a measuring tool that will give you the most appropriate precision.  Absolute uncertainty can be used to indicate the precision of your measurement

 an indication of the agreement among a number of measurements made in the same way (i.e. with the same measuring tool and procedure)  The more consistent your results are, the higher the precision is  High precision implies small amount of random error