Questions on how to plan an experiment to gain the best results. Also suitable for questions on why other researchers followed a certain procedure.

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What are the factors to consider when determining the sample size for a given study?

Say I'm designing a retrospective study (where I'd collect data from various schools for the last 5 years) to see if consuming milk can contribute to childhood obesity. How do I decide on how many ...
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How were the synaptic areas identified in the somatic sensation pathways?

I'm studying the somatic sensation pathways in neuro-anatomy and I was wondering what was the experimental procedure for identifying the number and location of the synapses in these pathways? ...