A budget "variance" is the difference between planned and actual performance.
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actual budget/budget = variance%
This years' sales plus last years' sales divided by 2
Square the standard deviation to obtain the variance. The variance is 62 or 36.
A mix of linear regression and analysis of variance. analysis of covariance is responsible for intergroup variance when analysis of variance is performed.
It is a biased estimator. S.R.S leads to a biased sample variance but i.i.d random sampling leads to a unbiased sample variance.