Keep this link on hand for the ultimate list of statistical calculators. The site features good basic sample size calculators as well as calculators for more advanced research methodologies (see Power Calculators or Correlation and Regression Calculators). Remember that market testing and research are at the heart of good marketing ROI practices. The more insight you can gain into what marketing activities, campaigns, offers and segmentation are driving your profitability, the better to improve your returns. For the more sophisticated calculators, you’ll need to have a good understanding of statistical terms, since these are student projects and there is no documentation to guide you. On the other hand, the site even offers a tool for those creative folks with “mathphobia” — check out the RGB calculator, which will show you Web colors and the corresponding hexadecimal code. [WDFM Annotation]
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