(DIR) xkcd - A Webcomic of Romance, Sarcasm, Math and Language.
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       xkcd - A Webcomic - Change in Slope (2701)
        
       Image:
 (PNG) change_in_slope.png
        
       Squinting at a graph is fine for getting a rough idea of the
       answer, but if you want to pretend to know it exactly, you neeed
       statistics.
        
       Comics reproduced from www.xkcd.com under license.
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