DA0-002 Data Acquisition and Preparation Practice Question
A data analyst needs to perform a stratified random sample of a customer database. Which TWO steps are essential for this sampling method? (Select two.)
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
✓
Randomly select a proportional number from each stratum
Stratified sampling requires dividing the population into strata and then randomly sampling from each stratum.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Use simple random sampling on the whole population
Why it's wrong here
Stratified sampling uses strata, not just simple random.
- ✗
Randomly select entire clusters of customers
Why it's wrong here
That is cluster sampling.
- ✓
Randomly select a proportional number from each stratum
Why this is correct
Proportional selection ensures representation.
- ✓
Divide the population into homogeneous subgroups (strata)
Why this is correct
Strata are defined based on key characteristics.
- ✗
Select every nth customer from a list
Why it's wrong here
That is systematic sampling.
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