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biology ee - how much data needed?

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Hey guys!

I am planning on doing my EE in biology, and I'm comparing diets of people and their vitamin intake.

So my idea was to survey people and have them record everything they eat for 5 days. 

My original plan was to have 4 test subjects for each group, but my supervisor said I need at least ten per group (so twenty in total) :( 

My problem is that I don't think that I can get so many people who will actually want to do this for an entire week...

What would you say? I have seen some examples of diet comparison EE's online, and they only had around three test subjects... did they just get a very bad grade then?

I'm happy about any advice :) Thanks


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