Determine necessary sample size

2012 12 18
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Hey,
imagine I am comparing two populations. I tested a certain amount of individuals from each population for a specific property, for example speed. I observe a difference between these two groups but it is not sufficiently significant. If this difference really exists, is there a way to do an educated guess how much more individuals I need to test to reach significance?
If so, what would be the Matlab code?
Thanks! Tristan

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