CISA Information System Auditing Process Practice Question
An IS auditor uses statistical sampling to test a population of 10,000 transactions. The auditor discovers 5 errors in the sample of 200. Which of the following conclusions is most appropriate?
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
✓
The population error rate is likely between 1% and 4% at a given confidence level
Based on sample results, the error rate is 2.5%, which can be projected to the population with a confidence level.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The population error rate is exactly 2.5%
Why it's wrong here
Statistical sampling provides an estimate, not an exact rate.
- ✗
The population has a material weakness
Why it's wrong here
Materiality depends on the error nature, not just rate.
- ✗
The population error rate is 5%
Why it's wrong here
No direct extrapolation without considering sampling error.
- ✓
The population error rate is likely between 1% and 4% at a given confidence level
Why this is correct
Sampling yields a confidence interval around the sample error rate.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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