Lec1 ErrorPropagation

Lec1 ErrorPropagation - Physics 257 Lecture 1: Error...

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Physics 257 Lecture 1: Error Propagation & Matlab Prof. Matt Dobbs Physics Department, McGill U. Prof. M. Dobbs, Physics 257 Sept 13, 2007 2 TA Office Hours ± The TAs are there to help you… use them! ± Lab TAs ¾ You may see these TAs during their office hours and ask questions about the lab and lab report writeup only. Questions about the error analysis should be directed to Mrs. Engelberg. ± Assignment TA ¾ You may see this TA during his office hours and ask questions about the assignments only. Prof. M. Dobbs, Physics 257 Sept 13, 2007 3 Access to the Computer room The Computer room (Wong bldg room 0080) is unlocked from 9:00 to 4:30 pm during regular school days. z This room is equipped with a card reader to give you 24/365 access. z If you are interested in having 24/365 access send an e-mail to Saverio.Biunno@McGill.ca requesting access for this room. Include: 1. your Family Name (exactly as on your McGill ID) 2. your First Name (Exactly as is on your McGill ID) 3. McGill ID Number 4. a 4 digit pin number ( you have to generate this pin number / you will need to enter this on the card reader) 5. Note: if you have a pin number from another card reader at McGill (same system) do NOT send a pin number / just say that you already have one. It is the same pin all across McGill. 6. A Physics course that you are currently taking (preferably a Physics Lab Course). ¾ Saverio will process your request on Mondays and Thursdays afternoons. Prof. M. Dobbs, Physics 257 Sept 13, 2007 4 Outline ± Questions ? ± error propagation with partial derivatives ± mean, weighted averages ± error on the mean ± Examples and your favorite Statistics ± More Matlab + how to plot histograms
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Prof. M. Dobbs, Physics 257 Sept 13, 2007 5 Errors on derived Quantities Prof. M. Dobbs, Physics 257 Sept 13, 2007 6 Prof. M. Dobbs, Physics 257 Sept 13, 2007 7 Examples: Errors on derived quantities ± Example: x=0.5±0.1, y=0.9±0.3. What is the error on z = x 2 +y 2 ? Is this point consistent with a point on a circle? Prof. M. Dobbs, Physics 257 Sept 13, 2007 8 Examples: Errors on derived quantities
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Prof. M. Dobbs, Physics 257 Sept 13, 2007 10 The Error on the Mean ± Normally we are trying to estimate a true value μ . The error on the estimate of the mean is the experiment error.
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This note was uploaded on 04/29/2008 for the course PHYS 257 taught by Professor Dobbs during the Fall '07 term at McGill.

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Lec1 ErrorPropagation - Physics 257 Lecture 1: Error...

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