Add article describing "optimal" sample size relative to power calculations.

Author: lgreski

statinf.md

@@ -13,6 +13,7 @@ permalink: /statinf/
 - [Kable Tables with Data Frames](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/kableDataFrameTable.md) illustrates how to display a custom table in a `knitr()` document by creating a data frame to contain the information to be rendered with `kable()`.
 - [Interactive Confidence Interval Visualization](https://github.com/amcadie/interactive_CI)
 - [Installing MiKTeK on Windows 10 / Generate a PDF from knitr](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/statinf-generatePDF.md)
+- [Power calculations: optimal szmple size](https://github.com/lgreski/datasciencectacontent/blob/master/markdown/statinf-optimalSampleSize.md)
 
 ## Comprehensive Notes