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Favourable variance is that variance which is good for business while unfavourable variance is bad for business
Is the result of unsystematic differences among participants; that portion of the total variance in a set of data that remains unaccounted for a systematic variance is removed; variance that is unrelated to the variables under investigation in a study.
There are 7 variances associated with a budget ( which are generally calculated for controlling purposes) 1- Material Price variance 2- Material Quantity variance 3- Labor rate variance 4- Labor efficiency variance 5- Spending variance 6- Efficiency variance 7- Capacity variance
Equal in Variance
Pooled variance is a method for estimating variance given several different samples taken in different circumstances where the mean may vary between samples but the true variance (equivalently, precision) is assumed to remain the same. A combined variance is a method for estimating variance from several samples, given the size, mean and standard deviation of each. Mathematically, a combined variance is equal to the calculated variance of the set of the data from all samples. See links.