Books  Books 1  1 of 1 on ... to)/6 As the difference between (tp) and (to) for an activity increases, the.... 
... 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 28 by J. B. Rhine  1966  463 pages Full view 
