mediumMultiple ChoiceObjective-mapped
CISA Practice Question: During an audit of an organization's change…
During an audit of an organization's change management process, the IS auditor selects a sample of 50 change requests from a population of 500. The auditor finds that 3 of the 50 did not have proper approval. What is the estimated error rate in the population?
⚠ Common exam trap
The trap here is that candidates often mistakenly divide the number of errors by the total population (500) instead of the sample size (50), leading to the incorrect 3% answer, confusing the sample error rate with the population error rate.
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
✓
6%
The estimated error rate is calculated by dividing the number of errors found in the sample (3) by the sample size (50), yielding 6%. This is a point estimate of the population error rate, assuming the sample is representative. The auditor would then use statistical sampling techniques to determine a confidence interval for the true population error rate.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
3%
Why it's wrong here
This would be 3 errors out of 100, not the actual sample proportion.
- ✓
6%
Why this is correct
Correct: 3/50 = 6% is the point estimate of the population error rate.
- ✗
10%
Why it's wrong here
10% would be 5 errors, not 3.
- ✗
5%
Why it's wrong here
5% would be 2.5 errors per 50, not matching the observed 3.
Go deeper
Related to this question
About these practice questions
One of 995 original CISA practice questions on Courseiva, each with a full explanation and wrong-answer analysis — not exam dumps or protected exam content. Learn why practice questions differ from exam dumps →
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This CISA practice question is part of Courseiva's free ISACA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CISA exam.