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Visual and lingusitic info post - Huff How to Lie with...

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Huff How to Lie with Statistics

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Averages Mean - Add up all the values in the set and divide by the number of items in the set. (Also sometimes called the arithmetic average) Median - The middle value; i.e. the value that has half of the items higher than it, and half lower* *If there are an even number of items than you take the arithmetic average of the two median numbers. Mode - The value that appears most commonly in the set.
Averages In many sets of numbers the various sorts of averages will not be very different values. It depends on how the values are distributed within the set. For some sets of values, though, there may be a very big difference between the different sorts of “average”.

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Averages It is also vital to look at what is included in calculating averages. What has been left out? Huff talks about “averages of salaries and profits” not including bonuses, for example How are the terms defined? What counts as a “family”?

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Our averages so far Mean - 357 Median - 371 (meaning have half of the class has scores above 371 and half of the class has scores below 371) Mode - either 292 or 324 (but this could be anything- there are 3 people with scores that round to these values, and two with scores rounding to 373, 377, 436, 437)
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Graphs The choice of how large of a range in include on the axes of graphs can
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Visual and lingusitic info post - Huff How to Lie with...

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