All 38 Variance Analysis questions
More in Variance Analysis
What is the sales mix variance? What is the sales quantity variance? What is the significance of controllable versus uncontrollable variances? How does the timing of the materials price variance calculation matter? What causes a favorable labour rate variance and an adverse one? How is the fixed overhead variance analyzed under absorption costing? What is the difference between the sales volume variance valued at contribution versus profit? What is the materials mix and yield variance? What are planning and operational variances? How can variances be interdependent, and why does that matter?
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Budgeting & Forecasting › Variance Analysis

How do you decide the significance of a variance statistically?

Intermediate

Answer

Set control limits (e.g., based on the standard deviation of past variances or a percentage of budget); variances beyond the limit are deemed significant and investigated, while those within are treated as random noise. This statistical management-by-exception focuses attention on genuinely abnormal results.
Real-world example Only variances beyond two standard deviations from the norm trigger investigation.

Common follow-ups: What are control limits? | How does this focus attention?

The Budgeting Process Variance Analysis Variance Analysis
All 38 Variance Analysis questions