2004 Presidential Election. The following two slides show each candidate’s predicted percentage of votes from the polls taken two weeks before the election. Who do you think won?. Candidate 1: Candidate 2:. How was the data misrepresented?. By the Scale that was chosen
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2004 Presidential Election The following two slides show each candidate’s predicted percentage of votes from the polls taken two weeks before the election.
How was the data misrepresented? • By the Scale that was chosen • By the Interval that was chosen
Ways to misrepresent data • By the Scale that is chosen • By the Interval that is chosen • Not starting at 0 • No title • No labels
These graphs represent the increase in cellular phone use from 1990 to 2000. Which graph makes it look like there was a greater increase in cell phone use?
These graphs represent the number of cars sold by a particular dealership from 1995 to 1999. Which graph makes it look like there was little decrease in sales?
Other ways to misrepresent data….. In a company, there are 10 employees that make $10,000 a year. The boss makes $80,000 a year. A job recruiter tells interested applicants that the typical salary for the company is $16,363 a year.
What measure (mean, median, or mode) did the job recruiter use? • Mean • What measure should the job recruiter have used? • Median
When do we use Mean, Median, or Mode? • Mean—when the data values are close together. • Median—when there are extreme values. Be sure there are no big gaps in the middle of the data. • Mode—when there are many identical numbers.
Ways to Misrepresent Data • By the Scale that is chosen • By the Interval that is chosen • Not starting at 0 • No title • No labels • Using an inappropriate measure of center (mean, median, or mode).
Sources • http://www.glencoe.com/sec/math/prealg/prealg03/extra_examples/chapter12/lesson12_5.pdf • http://images.google.com/imgres?imgurl=http://www.ced.appstate.edu/~goodmanj/workshops/ABS04/graphs/chevrolet.jpg&imgrefurl=http://www.ced.appstate.edu/~goodmanj/workshops/ABS04/graphs/graphs.html&h=640&w=479&sz=99&tbnid=r1-8gyPpdXUJ:&tbnh=135&tbnw=101&hl=en&start=7&prev=/images%3Fq%3Dmisleading%2Bgraphs%26svnum%3D10%26hl%3Den%26lr%3D%26rls%3DGGLD,GGLD:2005-16,GGLD:en%26sa%3DN • Cnn.com