1. 1 Press Ctrl-A ©G Dear 2010 – Not to be sold/Free to use Applied Mathematic (Preliminary General 1) MisleadingGraphs Stage 6 - Year 11

2. 2 End of Slide In the business world we don’t want to create misleading graphs Three types (of many) are: 1.Displaced Axes. Does not start at zero. 50 60 70 80 2.Exaggerated Area or Vol. Size exaggerates the difference. 3.Displaced Axes. Axes are irregularly numbered. 0 10 100 1000 0 10 20 30

3. 3 80 000 81 000 82 000 Average House Price Massive Increase In House Prices this Year 1998 1999 Year Displaced Axes The increase in price was not as big as it appeared to be. 20 000 40 000 80 000 Average House Price 1998 1999 Year 0 60 000 End of Slide

4. 4 0 100 200 300 400 500 600 700 800 900 1000 PizzaHot DogsHamburgers Favourite Food Displaced Axes 950 955 960 965 970 975 980 985 990 995 1000 PizzaHot DogsHamburgers Favourite Food Number of Votes The number of votes appears significantly here. The number of votes appears not so significantly here. End of Slide

5. 5 Exaggerated use of Area or Volume. Number of Singles Sold 1995 1996 1997 1998 purple The Brown column looks bigger than the purple column.. But is it? Number of Singles Sold 1995 1996 1997 1998 End of Slide

6. 6 This is bad. The various sized pictures distorts the graph. All pictures must be the about the same size.(Area) Dog: Cat: Horse: The Exaggerated use of Area or Volume. Key: 505050 Dog: Cat: Horse: Key: 505050 This is much better End of Slide

7. 7 doubled Sales at Gerry’s Milkbar have doubled from 2007 to 2008. 20072008 The 2008 volume is eight times bigger than the 2007 volume. Exaggerated use of Area or Volume. End of Slide

8. 8 Irregular Scale Axes 1993, 1996 and 1998 are missing. End of Slide Source: www.scribd.com/doc/19047168/19-Misleading-Graphs

9. 9 Irregular Scale Axes 1993, 1996 and 1998 are added. End of Show Source: www.scribd.com/doc/19047168/19-Misleading-Graphs