http://spreadsheets.about.com/od/spreadsheetlessons/ss/excel_graph_use_4.htm
Scatter plots show the relationship between two variables, shown by a general increase or decrease in the slope of a trend line. The trend line is not shown in this plot of the ability to increase concentration of a certain species in solution as you raise the temperature, but we can see that the slope is positive so the relationship can be defined from the trend--showing that if we increase the temperature, the concentration can also be increased.
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