Percent Error Theoretical
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Percent Error Definition
to zero means you are very close to your targeted value, which is good. It is always necessary to understand the cause of the error, such as whether it is due to the imprecision of your equipment, your own estimations, or a mistake in your experiment.Example: The 17th century Danish astronomer, Ole Rømer, observed that the periods of the satellites of Jupiter would appear to fluctuate depending on the distance of Jupiter from Earth. The further away Jupiter was, the longer the satellites would take to appear from behind the planet. In 1676, he determined that this phenomenon was due to the fact that the speed of light was finite, and subsequently estimated its velocity to be approximately 220,000 km/s. The current accepted value of the speed of light is almost 299,800 km/s. What was the percent error of Rømer's estimate?Solution:experimental value = 220,000 km/s = 2.2 x 108 m/stheoretical value = 299,800 km/s 2.998 x 108 m/s So Rømer was quite a bit off by our standards today, but considering he came up with this estimate at a time when a majority of respected astronomers, like Cassini, still believed that the speed of light was infinite, his conclusion was an outstanding contribution to the field o
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Negative Percent Error
Politics & Government Pregnancy & Parenting Science & Mathematics Social Science Society & Culture what is a good percent error Sports Travel Yahoo Products International Argentina Australia Brazil Canada France Germany India Indonesia Italy Malaysia Mexico New Zealand Philippines Quebec percent error worksheet Singapore Taiwan Hong Kong Spain Thailand UK & Ireland Vietnam Espanol About About Answers Community Guidelines Leaderboard Knowledge Partners Points & Levels Blog Safety Tips Science & Mathematics Chemistry Next How do I http://astro.physics.uiowa.edu/ITU/glossary/percent-error-formula/ calculate the percent error in my experiment? Follow 3 answers 3 Report Abuse Are you sure you want to delete this answer? Yes No Sorry, something has gone wrong. Trending Now Philip Rivers Billy Bush Gabrielle Union Diane Kruger Shania Twain 2016 Crossovers Truman Capote Auto Insurance Quotes Samsung Galaxy Dating Sites Answers Relevance Rating Newest Oldest Best Answer: You are comparing two answers - the answer YOU https://answers.yahoo.com/question/index?qid=20080105094644AAaRg9L got and the answer that is ACCEPTED as correct. Usually your answer came from an experiment (always have error) and the accpeted answer came from a calculation or a much better lab! (your answer minus the accepted answer) divided by the accepted answer. Then multiply by 100. Your answer will be in percent. If the top quantity is an negative value, sometimes it is dropped (absolute value of the difference) to give the percent error. Source(s): Edgeoftown · 9 years ago 3 Thumbs up 0 Thumbs down Comment Add a comment Submit · just now Report Abuse (true answer - your answer) / true answer X 100 So if the real answer was 100 and you got 90, the percent error would be (100-90)/100 X 100 = 10% You can also take the absolute value of the answer also to always give a negative number. This will be determined by your professor Peter Boiter Woods · 9 years ago 3 Thumbs up 0 Thumbs down Comment Add a comment Submit · just now Report Abuse Percent Error = ((Experimental Value - Theoretical Value) / Theoretical Value) X 100 Dennis M · 9 years ago 7 Thumbs up 0 Thumbs dow
(where abs = absolute value) http://www.percentagecalculator.co/Percent-Error.html (Enter values into the blue boxes. Answer will appear in the black box.)Answers are rounded to 7 decimal http://www.calculator.net/percent-error-calculator.html places. Examples Example 1: A measured value is 45.6 The actual value is 46.0 What is the percent percent error error between the measured and actual values? Theoretical (actual) Value = 46.0 Experimental (measured) Value = 45.7 Percent Error = 0.65% Click to show this example in the calculator above. Example 2: An estimate is made percent error theoretical and its value is 115 The actual value is 95 What is the percent error between the estimate and actual value? Theoretical (actual) Value = 95 Experimental (estimated) Value = 115 Percent Error = 21% Click to show this example in the calculator above. Example 3: The number 2.7 has been rounded up to 3 What is the percent error between the rounded number and the actual number? Theoretical (actual) Value = 2.7 Experimental (rounded) Value = 3 Percent Error = 11% Click to show this example in the calculator above. Calculator / About / Privacy / Contact / Sitemap © 2013 PercentageCalculator.Co All rights reserved.
| Scientific Calculator | Statistics Calculator In the real world, the data measured or used is normally different from the true value. The error comes from the measurement inaccuracy or the approximation used instead of the real data, for example use 3.14 instead of π. Normally people use absolute error, relative error, and percent error to represent such discrepancy: absolute error = |Vtrue - Vused| relative error = |(Vtrue - Vused)/Vtrue| (if Vtrue is not zero) percent error = |(Vtrue - Vused)/Vtrue| X 100 (if Vtrue is not zero) Where: Vtrue is the true value Vused is the value used The definitions above are based on the fact that the true values are known. In many situations, the true values are unknown. If so, people use the standard deviation to represent the error. Please check the standard deviation calculator. Math CalculatorsScientificFractionPercentageTimeTriangleVolumeNumber SequenceMore Math CalculatorsFinancial | Weight Loss | Math | Pregnancy | Other about us | sitemap © 2008 - 2016 calculator.net