suurus, mis iseloomustab jaotuse dispersiooni paremini, kui väikse arvu mõõdiste alusel saadud standardhälve, quantity that characterised the dispersion better than the estimated standard deviation obtained from a limited member of observations, eksperimentaalse dispersiooni hinnang, mis on saadud samale mõõtesuurusele pika, hästikirjeldatud ja statistiliselt kontrollitud mõõteseeria põhjal, estimate of the experimental variance obtained from long series of observations of the same measurand in well-characterised measurements under statistical control, method for estimating variance of several different populations when the mean of each population may be different, but one may assume that the variance of each population is the same, and the numerical estimate resulting from the use of this method is also called the pooled variance