CISA Information System Auditing Process Practice Question
An IS auditor is testing the effectiveness of a control that requires dual authorization for all transactions over $10,000. The population consists of 5,000 transactions, of which 250 exceed the threshold. The auditor uses a sample of 50 transactions from the entire population and finds 3 exceptions. What type of sampling method did the auditor use?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Judgmental sampling
The auditor selected a sample from the entire population without stratification, and the selection method is not described as random or systematic; however, the description implies a non-statistical judgmental sample. Stratified sampling would require dividing the population into subgroups (e.g., by value).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Judgmental sampling
Why this is correct
The auditor selected a sample from the entire population without a statistical method, which is judgmental.
- ✗
Stratified sampling
Why it's wrong here
Stratified sampling would involve separating high-value transactions into a stratum.
- ✗
Random sampling
Why it's wrong here
Random sampling requires each item to have an equal probability; the scenario does not specify random selection.
- ✗
Systematic sampling
Why it's wrong here
Systematic sampling selects every nth item; not indicated.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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