Margin Of Error And Definition
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your inbox. Easy! Your email Submit RELATED ARTICLES How to Interpret the margin of error sample size Margin of Error in Statistics Statistics Essentials For Dummies Statistics For Dummies, 2nd Edition SPSS Statistics for Dummies, margin of error confidence interval calculator 3rd Edition Statistics II for Dummies Load more EducationMathStatisticsHow to Interpret the Margin of Error in Statistics How to Interpret the Margin of Error in Statistics Related Book Statistics For Dummies, http://stattrek.com/statistics/dictionary.aspx?definition=margin%20of%20error 2nd Edition By Deborah J. Rumsey You've probably heard or seen results like this: "This statistical survey had a margin of error of plus or minus 3 percentage points." What does this mean? Most surveys are based on information collected from a sample of individuals, not the entire population (as a census would be). A certain amount of error is bound http://www.dummies.com/education/math/statistics/how-to-interpret-the-margin-of-error-in-statistics/ to occur -- not in the sense of calculation error (although there may be some of that, too) but in the sense of sampling error, which is the error that occurs simply because the researchers aren't asking everyone. The margin of error is supposed to measure the maximum amount by which the sample results are expected to differ from those of the actual population. Because the results of most survey questions can be reported in terms of percentages, the margin of error most often appears as a percentage, as well. How do you interpret a margin of error? Suppose you know that 51% of people sampled say that they plan to vote for Ms. Calculation in the upcoming election. Now, projecting these results to the whole voting population, you would have to add and subtract the margin of error and give a range of possible results in order to have sufficient confidence that you're bridging the gap between your sample and the population. Supposing a margin of error of plus or minus 3 percentage points, you would be pretty confident
Sign Up Subjects TOD margin of error Definition + Create New Flashcard Popular Terms Analytical technique that accounts for the number of acceptable errors in an experiment. The margin of error is put into place so that an individual can review results and then determine the http://www.businessdictionary.com/definition/margin-of-error.html level of accuracy of the experiment by taking this + or - margin of error https://www.whatisasurvey.info/chapters/chapter10.htm into consideration. A smaller margin of error indicates trustworthy results and a larger margin of error means the results are not considered as accurate. manipulated var... quantitative da... qualitative dat... group representative... ABC analysis equipment environmental a... demographic fac... control variabl... Use 'margin of error' in a Sentence There was a wide margin of error for the upcoming project which margin of gave us a lot of leeway to make up our own minds. 19 people found this helpful Some business run on a small margin of error and even the slightest mistake can have absolutely drastic results for them. 16 people found this helpful Some products have a very slim margin of error and you must make sure that they are made perfectly every time. 15 people found this helpful Show More Examples You Also Might margin of error Like... Adam Colgate 9 Options for Small Town Entrepreneurs Living in a town with a small population presents a unique challenge to entrepreneurs. A narrow local market means the margin for error is greater than in centers of higher population. But a small town presents a great opportunity to form strong ... Read more Adam Colgate Want to Increase Your Credit Score Quickly? Here ... Jeffrey Glen Advise vs. Advice Adam Colgate Top 7 Highest Paying Jobs in the United States Adam Colgate More Resources Below are additional resources for BusinessDictionary users. Interact with us on social media and read funny definitions and useful articles. Fun and Games Although we're known for our high-quality glossaries, some definitions have room for ... Read more Email Print Embed Copy & paste this HTML in your website to link to this page margin of error Browse Dictionary by Letter: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Never miss another term. Sign up for our FREE newsletter today! © 2016 WebFinance Inc. All Rights Reserved.Unauthorized duplication, in whole or in part, is strictly prohibited. Privacy, Disclaimers & Copyright COMPANY About Us Contact Us Advertise with Us Careers RESOURCES Articles Flashcards Citations All Topics FOLLOW US OUR APPS
of respondents favor Ms. Smith in the upcoming mayoral election. There is a margin of error of 3 percentage points." What does a statement like this mean? This pamphlet attempts to answer this question and to provide some cautions on the use of the "margin of error" as the sole measure of a survey's uncertainty. Surveys are typically designed to provide an estimate of the true value of one or more characteristics of a population at a given time. The target of a survey might be the average value of a measurable quantity, such as annual 1998 income or SAT scores for a particular group. a proportion, such as the proportion of likely voters having a certain viewpoint in a mayoral election the percentage of children under three years of age immunized for polio in 1997 An estimate from a survey is unlikely to exactly equal the true population quantity of interest for a variety of reasons. For one thing, the questions maybe badly worded. For another, some people who are supposed to be in the sample may not be at home, or even if they are, they may refuse to participate or may not tell the truth. These are sources of "nonsampling error." But the estimate will probably still differ from the true value, even if all nonsampling errors could be eliminated. This is because data in a survey are collected from only some-but not all-members of the population to make data collection cheaper or faster, usually both. Suppose, in the mayoral election poll mentioned earlier, we sample 100 people who intend to vote and that 55 support Ms. Smith while 45 support Mr. Jones. This would seem to suggest that a majority of the town's voters, including people not sampled but who will vote in the election, would support Ms. Smith. Of course, just by chance, a majority in a particular sample might support Ms. Smith