Random sampling
It can reduce selection bias when a suitable sampling frame and random mechanism are available, but random selection alone does not fix an incomplete frame or non-response. Define the population and sample size, document the selection method and assess whether the resulting evidence supports the intended conclusion.
Worked example
From a complete list of 1,000 invoices, a random mechanism selects 50 without favouring any invoice. The team then checks whether missing documents create non-response bias.
Common mistake
Calling a convenient set of invoices random merely because no deliberate preference was intended.
Where it appears in your exams
| Qualification | Exam | Relationship | Period |
|---|---|---|---|
| ACCA | MA | Direct | September 2026–June 2027 |
| FIA | FMA | Direct | September 2026–June 2027 |