2AccuracyAccuracy = the extent to which a measured value agrees with a standard valueAccuracy of a device must be checkedDoes it read a proper accepted value?Beware of Parallax – the apparent shift in position when viewed at a different angle.
3Example: AccuracyWho is more accurate when measuring a book that has a true length of 17.0 cm?Susan:17.0 cm, 16.0 cm, 18.0 cm, 15.0 cmAmy:15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
4PrecisionPrecision = the degree of exactness of a measurement that is repeatedly recorded.Which set is more precise?18.2 , 18.4 , 18.3517.9 , 18.3 , 18.8516.8 , 17.2 , 19.44
5Example: PrecisionWho is more precise when measuring the same cm book?Susan:17.0 cm, 16.0 cm, 18.0 cm, 15.0 cmAmy:15.5 cm, 15.0 cm, 15.2 cm, 15.3 cm
6Accuracy vs Precision Groupings Precise, not accurate Accurate, not precisePrecise and accurateGroupings
7Accuracy vs. Precision Less Precise More Precise More Accurate Less Accuratex
9Accuracy vs. Precision High Accuracy High Precision High Precision Low Accuracy
10Can you hit the bull's-eye? Three targets with three arrows each to shoot.Both accurate and precisePrecise but not accurateNeither accurate nor preciseHow do they compare?Can you define accuracy vs. precision?
13Why Is There Uncertainty? Measurements are performed with instruments, and no instrument can read to an infinite number of decimal placesWhich of the instruments below has the greatest uncertainty in measurement?
14Evaluate whether the following are precise, accurate or both. High AccuracyHigh PrecisionLow AccuracyLow PrecisionLow AccuracyHigh Precision