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CISA Practice Question: An IS auditor is selecting an appropriate audit…
An IS auditor is selecting an appropriate audit sample. Which THREE of the following are factors that affect the sample size?
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
✓
Tolerable error rate
Sample size is influenced by the expected error rate, tolerable error rate, and 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.
- ✓
Tolerable error rate
Why this is correct
Lower tolerable error rates require larger samples.
- ✓
Confidence level
Why this is correct
Higher confidence levels require larger samples.
- ✗
Sampling interval
Why it's wrong here
Sampling interval is a result of sample size, not a determinant.
- ✓
Expected error rate
Why this is correct
Higher expected error rates typically require larger samples.
- ✗
Population standard deviation
Why it's wrong here
Standard deviation is used for variable sampling, not generally for attribute sampling in compliance tests.
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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.