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Line 32: * Confidence level in E value + 2 × SD is approximately 95% * Confidence level in E value + 3 × SD is approximately 99.5% * ~~IS{{Clarify\|date=August~~Information ~~2009}}~~Systems uses the 95% confidence level, i.e. E Value + 2 × SD, for all project and task estimates. These confidence level estimates assume that the data from all of the tasks combine to be approximately normal (see [[Asymptotic distribution#Asymptotic normality\|asymptotic normality]]). Typically, there would need to be 20–30 tasks for this to be reasonable, and each of the estimates E for the individual tasks would have to be unbiased.

Three-point estimation: Difference between revisions