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I would recommend doing a bar graph for your data. For each sample, you would have one bar for the control results and one for each dilution:
Here is a site that will help you make a bar graph. http://nces.ed.gov/nceskids/graphing/cl ... rtType=bar
Here is the information from the Science Buddies website on presenting your data.http://www.sciencebuddies.org/science-f ... checklists
It would be great to record the production of gas as a function of time and do a line graph but I think the bar graph would be a clearer way to present your data.
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