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The variances are squared so that all deviations above and below the mean become positive values. Taking the square root of the variance then gives a measure of the differences from the mean: the standard deviaton.
Squaring the deviations also makes the bigger differences stand out. Look at 100 squared vs 10 squared.
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Using a pooled sample estimator for sigma squared assumes the two populations have what?
equal variances
What does activity-level variances plus flexible-budget variances equal?
total master-budget variances
What are adverse variances?
Adverse variances means unfavourable variance which is actual expenses are more than budgted variance.
Why are variances generally segregated in terms of a price variance and an efficiency variance?
Efficiency Varian materials and direct labor, the variances were recorded in specific general ledger accounts.
What does the F statistics tell you?
The difference between two variances
Using a pooled sample estimator for sigma squared assumes the two populations have what?
equal variances
In the calculation of variances why are they squared?
Try calculating the variance without the squaring bit - it gives 0 every time. Squaring allows you to ignore the direction (sign) of the number.
What does activity-level variances plus flexible-budget variances equal?
total master-budget variances
The variances that should be investigated by management include?
should all variances be investigated
When comparing two variances or standard deviations is an f-test is used?
An F-test can be used for variances.
What are adverse variances?
Adverse variances means unfavourable variance which is actual expenses are more than budgted variance.
What is unit square?
Square units measure area.
Which is the correct set of assumptions needed for comparing 3 or more means?
Equal variances, independent observations and normality
Why are separate price and quantity variances computed?
Price and quantity variances are computed respectively because different managers are usually responsible for buying and for using inputs.
Why are variances generally segregated in terms of a price variance and an efficiency variance?
Efficiency Varian materials and direct labor, the variances were recorded in specific general ledger accounts.
The formation of waves is a result of what?
Momentum transfer or pressure variances.
What does the F statistics tell you?
The difference between two variances
