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Hi gang, I was wondering if you could talk me through your experimental design -
I think your choice of light colors is great, and white is the perfect control. How are you making your different light colors?
Are you placing three plants under each light (total of 12 plants)? I just want to make sure I'm reading it right.
Also, height is a great dependent variable to measure. I would advocate for including additional DVs like number of leaves, shoot or leaf mass (weigh them on a scale), or even plant appearance (scale of 0-3: 0 = dead, 1 = growth looks poor, 2 = growth looks ok, 3 = growth looks strong). It's nice to plan on taking as much data as possible in case the one DV you choose to measure doesn't capture the differences you're seeing in plants under different treatments (it's saved me a few months of having to repeat experiments in the past!).
Another thing I'd like to know is what your control variables are (the things you'll keep the same between all the groups)? An example would be placing all the lights at the same distance from the plants.
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