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How to determine whether the number of data required to be taken for a experiment?

eg: I need to take a set of data for the noise mapping, how many should I take ?

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This is connected to power analysis, that enables you to estimate a desirable sample size for analysis. There are different methods for different statistical tests, here you can find a tutorial on using pwr R package for t-test. In Spiegelhalters et al. book you can find examples of dealing with this kind of problems in Bayesian fashion.

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