PPT-Accuracy Precision % Error

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. 1 02 03 04 05 06 07 08 09 1 Measured Value of x Fraction of Total Measurements SD 01 SD 02 SD 03 brPage 5br mean standard deviation histogram Figure 3 Mass of Unknown Sample 102 104 106 108 11 112 114 116 118 12 Mass kg of Measurements brPage 6br 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). 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.. Blake Laing. Southern Adventist University. I. uncertainty . Measurements have . no meaning. without a quantified experimental error/uncertainty . George: . What can he conclude?. Martha: . 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. 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 . © 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 . Friday. , September 2. nd. , 2016. 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:. Adding & Subtracting . The Rule: The denominator(s) must be the same. Ex: . 3 . + . 5 . - . 1 . = ? . 4 8 3 . Common denominator is…... …..24 . 1. Statistical Significance and Performance Measures. Just a brief review of confidence intervals since you had these in Stats – Assume you've seen . t. -tests, etc.. Confidence Intervals. Statistical Significance.