PPT-Accuracy and Precision of Measurement

2012 Project Lead The Way Inc Introduction to Engineering Design Recording Measurements A measurement always includes a value A measurement always includes units A measurement always involves . Chapter 1 Section 2. Accuracy. describes how close a measured value is to the true value of the quantity measured. . . a.k.a. “the right answer”, or the agreed upon answer (“consensus” among scientists). Variable is a factor that affects the outcome of an experiment.. 3 Types of variables. Experimental/ Independent Variable. The variable that you change . Dependent Variable. The variable that you measure. Chapter 1 Section 2. Accuracy. describes how close a measured value is to the true value of the quantity measured. . . a.k.a. “the right answer”, or the agreed upon answer (“consensus” among scientists). Precision. Accuracy. Error Types. Significant Digits. Error Propagation. Error in Measurement.  . "Accuracy" means truth.. "Precision" means detail..  . Accuracy. Accurate: measured value very close to actual value.. Define: . Accuracy. Precision. Draw & . Label. 4 dart boards to illustrate:. . (. each board should contain . 4 marks. ). High Accuracy, High Precision. High Accuracy, Low Precision. Low Accuracy, High Precision. 5700. 1. 2. 3. 4. Multiply. 843.5 * 21103. 17800380.5. 1.780 x 10. 8. 1.780 x 10. 7. 17800000. Which of the following instruments would give you the most accurate measurement?. Round to 3 significant digits.. Tuesday, August 25. th. , . 2015. Accuracy . vs. Precision –. Accuracy. – how close a measurement is to the actual value. Precision. – how close a group of measurements are to each other.. Look at each target below and decide whether the situation is accurate, precise, both, or neither:. CONTEXT. There are two . contexts precision . and accuracy apply to: sets of data, and measuring instruments.. In a set of data, those measures give an idea of the spread and “. ballpark. ” of the answer (final measurement).. 1 Accuracy and Precision Notes Chemistry 1 2 Uncertainty in Measurements There is no such thing as a perfect measurement! All measurements have a degree of uncertainty because Instruments have flaws 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 . Introduction to Engineering Design. The U S Customary . System. System of measurement used in the United States . Similar to the British Imperial System of Measurement, but not identical. Common U S Customary. Adding & Subtracting . The Rule: The denominator(s) must be the same. Ex: . 3 . + . 5 . - . 1 . = ? . 4 8 3 . Common denominator is…... …..24 . Karen L. Edwards, . PhD. Professor, Dept. of Epidemiology. School of Medicine. University of . California, Irvine. Irvine, CA. Outline. Two National Initiatives . Precision Medicine Initiative . Cancer . Battery management systems. 1. Reference Designs / Collateral. Automotive High-Voltage and Isolation Leakage Measurements Ref. Design. Leakage Current Measurement Ref. Design for determining Insulation Resistance.