... to)/6 As the difference between (tp) and (to) for an activity increases, the standard deviation and therefore the variance for the activity's expected duration increases. A large standard deviation (se) represents a high degree of uncertainty associated... ESP After Sixty Years - Page 28by J. B. Rhine - 1966 - 463 pagesFull view
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Bob Campbell - Technology & Engineering - 2002 - 352 pages
...variance is the sum of the manufacturing and measurement variances: "total "manufacturing ' "mi-aMjremenl Since the standard deviation is the square root of the variance, the standard deviation (a) of the total process is the square root of the sum of the individual standard...