Excel’s NORM.INV perform calculates the inverse of the traditional cumulative distribution for a specified imply and normal deviation. Given a likelihood, this perform returns the corresponding worth from the traditional distribution. For example, if one inputs a likelihood of 0.95, a imply of 0, and a typical deviation of 1, the perform returns the worth under which 95% of the distribution lies.
This performance is key in numerous statistical analyses, together with threat evaluation, speculation testing, and confidence interval dedication. Its origins are rooted within the broader software of regular distribution ideas, a cornerstone of statistical modeling. Understanding and using this perform permits for the estimation of values based mostly on probabilistic situations, enabling knowledgeable decision-making throughout numerous fields.
