Back to results for “Audit Evidence & Procedures”
Auditing & Assurance › Audit Sampling

What is the difference between statistical and non-statistical sampling?

Beginner

Answer

Statistical sampling uses random selection and probability theory to measure sampling risk and quantitatively project results, giving objective, defensible conclusions. Non-statistical (judgmental) sampling relies on the auditor's judgment for selection and size without measuring sampling risk mathematically. Both must yield representative samples; statistical adds measurability.
Real-world example The auditor uses statistical sampling to quantify the projected error and its precision, versus a judgmental pick for a small test.

Common follow-ups: What does statistical sampling let you measure? | Must non-statistical samples be representative?