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Line 35: * The 95% confidence interval for the true project work time is approximately E(project) ± 2 × SD(project) * The 99.7% confidence interval for the true project work time is approximately E(project) ± 3 × SD(project) * Information Systems typically uses the 95% confidence interval for all project and task estimates.<ref>[[~~68-95-99~~68–95–99.7 rule]]</ref> These confidence interval 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