Year+11+15th+August

=Focus on Misleading Graphs and Types of Graphs= Warm up @Applet Algebra Skills =Aim: To create a list of misleading tricks to watch out for= Start: think:pair:share in group:present to class Brainstorm on your own for 90 seconds Share with a peer 120 seconds Share with a group 4 minutes Present to class =Our List=

Labels
Missing or incomplete information

Scale:
Missing units, missing labels Label the y axis incorrectly eg. Using the wrong units Uneven Scale eg 1,2,4,8,16,32 Scale does not include Zero, starting at a large number distorts the picture

Size of bars or pictures:
Not representing the size of the values, eg 2 bars of the same value are displayed as different sizes If a value is double, the height and width of the bar in the graph are doubled, giving four times the area.

Time Series graphs:
Comparisons made between different “seasons”. Eg December sales of 1990 compared to June sales of 2010. Then silly statements made comparing 1990 with 2010.

Unfair Comparisons
Comparing the frequency of an event (like speeding tickets) on the y axis, with groups (of ages of drivers) of different sizes (each age group does not have the same number of drivers) on the x axis.

Other Distortions
3D graphs giving a distorted view Incomplete data, eg only looking at one months statistics per year, and conclusions made about the entire year.

Other Ideas:
Addition of a line to show an incorrect trend Extending a line beyond plotted points that suggests (with no basis) what might happen

=FAST TRACK: Pages 118 to 151 is all important= =ON TRACK: Pages 123 to 161 is all important= You need to know all the graph types, all the language and remember this is about statistical literacy and probability.

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