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Because it is statistically insignificant. The larger the study cohort, the more accurate the results.How would you know what is too small a sample size for this particular study?
Determination of the optimal sample size for a clinical trial accounting for the population size
The problem of choosing a sample size for a clinical trial is a very common one. In some settings, such as rare diseases or other small populations, the large sample sizes usually associated with the standard frequentist approach may be infeasible, suggesting ...
www.ncbi.nlm.nih.gov
Sample Size Calculation in Clinical Trials: Part 13 of a Series on Evaluation of Scientific Publications
In this article, we discuss the purpose of sample size calculation in clinical trials, the need for it, and the methods by which it is accomplished. Study samples that are either too small or too large are unacceptable, for clinical, methodological, and ...
www.ncbi.nlm.nih.gov