How to Look at Graphs: Frequency Distribuions
Bin size...can turn bins into classes
Random distribution should be a clumped distribution. This is because one that appears evenly dispersed may be hyper-dispersed, which is a non random separation of the data. For an example, check out this site: http://2600hertz.wordpress.com/2010/03/12/how-random-is-random/
Mean, Median, and Mode:
http://www.fgse.nova.edu/edl/secure/stats/lesson1.htm
Geometric Mean:
http://www.cliffsnotes.com/study_guide/Geometric-Mean.topicArticleId-18851,articleId-18817.html
Range show distance between most extreme values.
And the standard (NOT AVERAGE) deviation:
NOTE** the n-1 (vs. n) is used for samples versus the entire population. See fudge factors next week
Or the variance:
To compare deviations of two different populations that may be on different scales:
To analyze which of two samples from two different populations differs 'more' from the mean:
TYPES OF DISTRIBUTIONS:
Poisson:
m=8 is a special case called the normal distribution.
Friendly fudge factor next week!!
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