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Topic: Margin of error

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	Margin of error - Wikipedia, the free encyclopedia
		The larger the margin of error, the less confidence one has that the poll's reported percentages are close to the "true" percentages, that is the percentages in the whole population.
		Equivalently, the margin of error is the radius of the 95% confidence interval.
		The margin of error is being confused with the confidence interval of reported percentages.
	en.wikipedia.org /wiki/Margin_of_error (3211 words)

	Margin - Wikipedia, the free encyclopedia
		In finance, a margin is the cash or collateral that a holder of a position in securities or in exchange traded derivatives is required to post to cover potential adverse movements in the value of the position.
		The margins are examined by a pathologist to evaluate the likelihood that the disease (for example, a cancer) has been completely removed.
		In execution of activity, "margin" of error means the 'edge' or 'point' at which one measures acceptable or unacceptable amounts or numbers of errors; the "cut-off" point.
	en.wikipedia.org /wiki/Margin (466 words)

	Opinion poll - Wikipedia, the free encyclopedia
		The margin of error can be reduced by using a larger sample, however if a pollster wishes to reduce the margin of error to 1% they would need a sample of around 10,000 people.
		Since the margin of error differs slightly with the percentage the margins of error in polls is usually reported for the 50-50 split; the margin of error is smaller for 40-60, 30-70, 20-80, etc. splits.
		Another source of error is the use of samples that are not representative of the population as a consequence of the methodology used, as was the experience of the Literary Digest in 1936.
	en.wikipedia.org /wiki/Opinion_poll (2355 words)

	Margin of error: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-10-21)
		The margin of error is an estimation of the extent to which a poll's poll quick summary:
		The margin of error can be calculated directly from the sample size (the number of poll respondents) and is commonly reported at one of three different levels of confidence[For more, click on this link].
		(the margin of error represents an upper bound to the uncertainty; one is at least 99 percent certain that the "true" percentage is within a margin of error of a reported percentage for any reported percentage.
	www.absoluteastronomy.com /encyclopedia/m/ma/margin_of_error.htm (3924 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		In statistics, including opinion polls and similar surveys, a margin of error is the radius of a confidence interval -- often a 90% confidence interval -- for a proportion of a population.
		If a 3% margin of error is reported, that means a procedure was used that will be within 3% of the proportion to be estimated, 90% of the time.
		The radius of that interval is 3%; that is the margin of error.
	www.wikiwhat.com /encyclopedia/m/ma/margin_of_error.html (346 words)

	Margin of Error
		Margin of Error and Confidence Intervals are descriptions of a range of scores that statistically define the probable limits of an aggregated measure.
		Calculation of a Margin of Error begins with the standard deviation (SD) and count of the number of data points (N) being used.
		To find the margin of error the standard error is multiplied by the z-score for the probability of error we are willing to accept.
	www.documentingexcellence.com /stat_tool/merror.htm (549 words)

	Margin of Error
		Quite often the margin of error is more important than the splashy headlines that tout the results of the poll.
		The margin of error is a necessary tool because few organizations have the time or money to survey the entire population on a particular subject.
		When reporting the margin of error for an entire study, a 50% average response is used because it is the most "conservative" estimate.
	www.westgroupresearch.com /research/margin.html (491 words)

	Sample Sizes, Margin of Error, Quantitative Analysis
		The margin of error on a survey statistic is calculated to reflect the desired level of confidence required, usually 95% confidence in New Zealand studies.An indication of the statistical margin of error applying to various samples is shown below, at 95% and 90% confidence respectively.
		These margins apply when the figure being measured is around 50%, and decline for smaller and larger figures.To interpret these figures, consider the margin of error of +5.7% at 95% confidence, on a sample of 300 interviews.
		At 95% confidence, the margin or error on a survey statistics, such as P% of the population do this, is calculated as follows.
	www.resolutions.co.nz /sample_sizes.htm (636 words)

	OCRegister.com
		But a 20-point margin of error means that the system can't reliably measure such fine changes in school performance, and a 649 indicates only that the true score is somewhere between 629 and 669.
		The margin of error, outlined in a report by Richard Hill, the director of the nonprofit National Center for the Improvement of Educational Assessment, is as great as 50 points for some small schools - meaning scores actually could fall anywhere within a 100-point range - and as narrow as eight for the largest.
		But the margin of error was not reported in the Public Schools Accountability Act that launched the API nor in documents sent to schools explaining it.
	www.ocregister.com /features/api/text_version/apiday100811cci1.shtml (3099 words)

	CORA - Queen's: Understanding Polling (Site not responding. Last check: 2007-10-21)
		"Margin of error" assumes that the sample is a random, representative sample of the population.
		"Margin of error" therefore is only a statistical calculation based on probability and the size of the sample; it says nothing about the quality of the poll itself.
		For example, in the case of a sample of 1000, the margin of error would be 3.1% (the result on your calculator should read 0.0316).
	www.queensu.ca /cora/polling.shtml (311 words)

	MaPSTeDI - A Guide to Georeferencing - Determine a Margin of Error
		The main advantages of the numerical margin of error is that it is easy to record and exact in its measurement of error.
		Unlike the numerical margin of error, however, it is also easy to determine and usually prevents against any sense of false precision because the margins of error are only limits and not exact numbers.
		The advantages are that it is possible to record an exact margin of error for some records while retaining the adaptability that allows other codes or predetermined shapes to be applied to other records.
	mapstedi.colorado.edu /GuideToGeoreferencing/Georeferencing2-3_MarginError.html (1427 words)

	Margin of Error (Site not responding. Last check: 2007-10-21)
		The term “margin of error” is repeated incessantly during election campaigns in the reporting of opinion polls.
		Putting sources of error aside for the moment, the balloting margin of error hardly concerned us in the past because it was usually exceeded by the margin of victory.
		Once the machine margin of error has been verified, additional counting by humans produces no valid information and the results may not be relied upon to refine the margin of victory.
	erazo.org /forum/marginoferror.htm (1082 words)

	Margin Of Error (Site not responding. Last check: 2007-10-21)
		The margin of error in a sample = 1 divided by the square root of the number of people in the sample.
		I had initially written it using a /- 3.5% margin of error (since that is more typical with the smaller samples of likely voters reported recently) but then decided the rounding made it too hard to...
		Margin collapsing is a CSS phenomenon I've been familiar with for a while.
	harrispoll.inkspoll.com /marginoferrorgzi (733 words)

	Margin of Error (Site not responding. Last check: 2007-10-21)
		Margin of Error deserves better than the throw-away line it gets in the bottom of stories about polling data.
		So you can think of the margin of error at the 95 percent confidence interval as being equal to two standard deviations in your polling sample.
		Don't overlook that fact that the margin of error is a 95 percent confidence interval, either.
	www.robertniles.com /stats/margin.shtml (549 words)

	Margin For Error (Site not responding. Last check: 2007-10-21)
		Because there is margin for error we can use present and past errors to reduce future errors, This is how we achieve our goals; how we improve; how we learn.
		But error is not an all or nothing proposition, it is a continuum of greater and lesser significance.
		Errors of behavior are the contending processes of life; there is no final perfect adaptation.
	home.att.net /~frankfab/Y2K/margin.html (575 words)

	Margin of error
		If 70% favors more vegetables with a margin of error of plus or minus 10, then the actual percentage of the total population favoring vegetables is between 60% and 80%.
		With a margin of error of plus or minus 3, the survey tells us that the actual percentage of voters favoring Candidate X is between 41% and 47% and the percentage favoring Candidate Y is between 38% and 44%.
		A random sample of 250 will have a margin of error of plus or minus 6, so that if a simple majority is 51%, you would have to have 57% to answer in one way to be confident that the majority held the same view.
	faculty.uncfsu.edu /jyoung/margin_of_error.htm (702 words)

	Margin of error (Site not responding. Last check: 2007-10-21)
		I am using what I think is the common meaning of "margin of error"; that is, a measure of uncertainty for a statistic computed from the data.
		A common example might appear as a statement such as "60% of those polled favored candidate A versus candidate B. The poll has a margin of error of + or - 4%." In this case, the data yield the 60% statistic.
		The size of the sample, etc. (in other words, the design of the poll which is usually not stated to the public), is used to guarantee in theory that there is a high probability that if we could afford to get all the data, the true percentage for it would be between 56% and 64%.
	www.newton.dep.anl.gov /newton/askasci/1995/math/MATH117.HTM (348 words)

	Margin of Error and Confidence Levels Made Simple
		For example, a survey may have a margin of error of plus or minus 3 percent at a 95 percent level of confidence.
		Margin of error – the plus or minus 3 percentage points in the above example – decreases as the sample size increases, but only to a point.
		Margins of error typically are calculated for surveys overall but also should be calculated again when a subgroup of the sample is considered.
	www.isixsigma.com /library/content/c040607a.asp (1344 words)

	Polls and margin of error, a little explainer
		It is important to realise that when a poll gives an error margin, it is obviously not absolutely certain that there is no more than 3 % difference between the opinion of the whole population and the people asked (the "sample").
		If you have a look at the actual formula and tables for confidence and margin of error, you will find that the intuitive reaction, that 1000 people can't possibly represent 200+ million, is wrong.
		The real error margin comes into play if there is any bias in the sampling, but that is beyond this little explanation.
	blogs.salon.com /0001561/stories/2003/12/31/pollsAndMarginOfErrorALittleExplainer.html (543 words)

	Andy Budd::Blogography: No Margin for Error
		By removing the border around the outer div, the margins of the contained elements are now adjacent to the margin of the preceding element (in this case a paragraph tag) and have all collapsed together.
		Another way to stop margins collapsing is to change the position property of the element.The CSS2 Specs explain that margins of absolutely and relatively positioned boxes don't collapse.
		The result is no extra margin being added to the bottom of #nav (Shrink the borwser window so the bottom of the window is near the bottom of #nav and there is no vertical scroll bar.) Add margin bottom to #nav and the scrollbar returns.
	www.andybudd.com /archives/2003/11/no_margin_for_error (2965 words)

	MARGIN OF ERROR AND OTHER POLLING TRICKS [Free Republic]
		It turns out that all the “margin of error” means is that if they went back to those same people and asked the same questions, the “margin of error” is the percentage of people that might answer the questions differently.
		The reason the margin of error is “plus or minus” a given percentage is because they can’t determine which of two conflicting answers is the respondent’s honest opinion.
		I had thought that "margin of error" in polling had something to do with "margin of error" that I learned in some college math courses: had something to do with sample size.
	www.freerepublic.com /forum/a383c16f97f55.htm (1293 words)

	Margin of error - dKosopedia
		The margin of error only measures the error due to the sampling process but does not factor in any other potential sources of error (for example, poorly worded questions, errors in universe identification, insufficient randomization or other methodological errors).
		The margin of error is actually smaller for percentages that are not close to 50%, so the percentage of undecided voters is between about 3% and 5% (see The Mathematics of Polling to how to compute these errors).
		The margin of error can be used to roughly examine the reliability of a particular polling firm.
	www.dkosopedia.com /wiki/Margin_of_error (346 words)

	America's Margin For Error
		In this new world, he said, "our margin of error is notably different." In the context of his remarks the apparent potential errors on his mind concerned possible failures to move speedily and decisively on the pending military attack on Iraq or on future military actions against al Qaida and other terrorists.
		Our margin for error is defined by the challenges we must meet to sustain our status and position.
		Rumsfeld is probably right in suggesting that our margin for error has changed, but he is mistaken in thinking that unilateral exercises of military power, even his lean, mean fighting machines, can fix the problem.
	www.rense.com /general46/margin.html (4024 words)

	Science In Action: Bush Poll Numbers -- Margin Of Error
		The "margin of error" figure buried somewhere in the article is the key to understanding just how hazy that "40%" number really is.
		Understanding the concept referred to by pollsters as "margin of error" is vital to understanding poll results.
		"Margin of error" is the term the media use for what statisticians call the "confidence interval".
	sxxz.blogspot.com /2005/09/bush-poll-numbers-margin-of-error.html (866 words)

	Margin of Error (Site not responding. Last check: 2007-10-21)
		But statistical conclusions always have a margin of error, so the results need to be reported + or - a certain percentage.
		However, at some point we enter the margin of error, and we need a gentleman's agreement for dealing with statistically insignificant differences.
		It functions primarily within the margin of error, and simply narrows the field of litigation.
	a-s.clayton.edu /hampikian/Writing/Election2000 (636 words)

	purevolume™ \| Margin of Error
		Margin of Error is a rock band from San Diego and was formed in early 2002.
		Margin of Error hasn't posted a blog yet.
		Margin of Error hasn't posted any shows yet.
	www.purevolume.com /marginoferror (76 words)

	Riley Research Survey Poll Brand Market Focus Political Track
		Which means that if a study were conducted 100 times, answers would be within the margin of error 95 out of 100 times.
		Margin of Error / Confidence Interval: Assumes that you have a random sample.
		The margin of error for a typical survey is +/- 5%.
	www.rileyresearch.com /sample_calculator.htm (305 words)

	Margin of Error (Site not responding. Last check: 2007-10-21)
		When reputable news organizations report the results of a survey, they typically quote the margin of error as plus or minus so many percentage points.
		The problem is that users of marketing research not infrequently ask what the margin of error is in a study.
		This margin is not only dependent on sample size, but also on the distribution (variation) of the data.
	www.action-research.com /marginbyte.html (221 words)

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