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Most research studies require you to determine, a-priori, the sample size for your study. In fact, sample size justification is one of the essential statistical considerations for most of the research studies. 
The sample size is required to be adequate enough to address most of the research questions and there are several factors which determine the required sample size. These factors include the power for your study, the effect size, and the alpha.
Statistical power analysis is used to justify a sample size and it determines how likely it is that one can detect a significant difference, that is, achieve statistically significant results, with a given sample size.
We at The Statistical Agency will help you address all the statistical consideration related to your research study, including a power analysis and sample size justification. In addition, we provide full support for any question you may have regarding the statistical analysis of your project work.
Contact Us to discuss your requirements in detail.

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Studio Leonardo
The statistical Agency
Ul.Svetog Ante bb, Cim
BA-88000 Mostar