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Accuracy, Precision, and Measurement
Transcript of Accuracy, Precision, and Measurement
& Measurement Accuracy Precision Relative Error Precision Measurement Parallax Error Refers to the agreement, or closeness
of a measurement value to the accepted
true value May be expressed in terms of relative error Also called percent error equal to the absolute value of the measured value minus the accepted value, divided by the accepted value, multiplied by 100% % error = (|Your Result - Accepted Value| / Accepted Value) x 100%
Refers to the smallest decimal
point obtained by a measurement Scale markings determine the possible
precision of an instrument limited by the finest division on the scale a measurement may be estimated to
one tenth of the finest printed interval degree of exactness in a measurement all digits known plus first
uncertain are SIGNIFICANT You must estimate that final
doubtful digit - 1/10th of the finest
printed interval The apparent shift in the position
of an object when the position of the
observer changes (viewed from different
angles). One of the most common errors Examples: looking at the clock
or speedometer How to avoid parallax error Line of sight MUST be at a right
angle to the scale