Accuracy vs. Precision.

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Accuracy and Precision

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Presentation transcript:

Accuracy vs. Precision

Qualitative vs. Quantitative Qualitative measurements give results in a descriptive nonnumeric form. (The results could be used to identify an unknown or to help describe one.) *Examples: ___________, ___________, blue, __________... Quantitative measurements give results in numeric form. (The results of a measurement contain a _____________.) *Examples: 4’6”, __________, 22 meters, __________... Accuracy vs. Precision Accuracy is how close a ___________ measurement is to the ________ __________ of whatever is being measured. Precision is how close ___________ measurements are to _________ ___________. shiny heavy cold number 600 lbs. 5 ºC single true value several each other

Accuracy vs. Precision

Practice Problem: Describe the shots for the targets. Bad Accuracy & Bad Precision Good Accuracy & Bad Precision Bad Accuracy & Good Precision Good Accuracy & Good Precision

Evaluating the Accuracy of a Measurement The “Percent Error ” of a measurement is a way of representing the accuracy of the value. (Remember what accuracy tells us?) % Error = (Accepted Value) − (Experimentally Measured Value) x 100 (Accepted Value) Practice Problem: A student measures the density of a block of aluminum to be approximately 2.96 g/mL. The value found in our textbook tells us that the density was supposed to be 2.70 g/mL. What is the accuracy of the student’s measurement? (Absolute Value) % Error = |2.70−2.96| ÷ 2.70 = 0.096296…x 100 = 9.63% error