CISA Information System Auditing Process Practice Question
An auditor is selecting a sample of purchase orders for testing. The auditor decides to select every 50th purchase order from a list. This is an example of:
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
✓
Systematic sampling
Systematic sampling selects items at a fixed interval (every nth item).
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 it's wrong here
Subjective selection.
- ✗
Random sampling
Why it's wrong here
Random selection without fixed interval.
- ✓
Systematic sampling
Why this is correct
Correct definition.
- ✗
Stratified sampling
Why it's wrong here
Involves subgroups.
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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.