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# There are three kinds of lies

## on Mar 15, 2012

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• Brainstorm here Statistics is the study of the collection, organization, analysis, and interpretation of data.[1][2] It deals with all aspects of this, including the planning of data collection in terms of the design of surveys and experiments.[1]
• Gives some examples here – medical experiments, horticulture and agriculture
• Activity 1 See task sheet for more details. Show friends video on youtube or direct from media file
• Show video here- direct media file is available
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## There are three kinds of liesPresentation Transcript

• Popularized by Mark TwainTwisting information to youradvantage…
• What areStatistics?
• Why arestatisticsuseful?
• What’s so good about Statistics? Statistics give us a way to look at the big picture and get a much more accurate way of understanding what is going on in the world than what we could get from individual observations.
• Misleading Statistics inAdvertising This toothpaste is recommended by nine out of ten dentists! Is this true?
• Misleading Statistics inAdvertising Statistics are a good way to show facts in an easy- to-understand format, such as a percentage. This has proven extremely successful because we, as consumers, like to believe all statistics are completely true
• Problems With Statistics While statistics are extremely valuable, they are also notorious for being a means that people use to make false and misleading arguments. There are some main ways to manipulate statistics The toothpaste advertisement is an example of selection bias.
• Selection Bias A good sample is representative. This means that each sample (person) represents the attributes of a known number of population. Bias often occurs when the survey sample does not accurately represent the population. The bias that results from an unrepresentative sample is called selection bias.
• Ways of Selection Bias:Undercoverage A common type of sampling bias is to sample too few observations from a segment of the population. A commonly-cited example of undercoverage is the poll taken by the Literary Digest in 1936 that indicated that Landon would win an election against Roosevelt by a large margin when, in fact, Roosevelt won by a large margin. A common explanation is that poorer people were undercovered because they were less likely to have telephones and that this group was more likely to support Roosevelt.