CISA Information System Auditing Process Practice Question
An IS auditor selects a sample of 50 transactions from a population of 1,000 using a random number generator. This is an example of which sampling method?
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
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Random sampling
Statistical random sampling gives every item an equal probability of selection.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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Stratified sampling
Why it's wrong here
Stratified sampling divides population into subgroups.
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Random sampling
Why this is correct
Random sampling uses a random selection method.
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Systematic sampling
Why it's wrong here
Systematic sampling selects every nth item.
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Judgmental sampling
Why it's wrong here
Judgmental sampling is non-statistical and subjective.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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