How to draw line graphs in general and for AQA biology ISA?

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I really don't understand how you produce your scale? When you obtain your results from a pracitcal you calculate the  mean of your readings such as time taken for something to change colour. Do you then round your time figures to place on a graph?  How would you devise a scale for both axis? Examples would be appreciated,

Posted Mon 21st January, 2013 @ 12:24 by Simran Takhi
Edited by Simran Takhi on Mon 21st January, 2013 @ 12:26