An auditor will use systematic sampling to select 60 invoices from a population of 4,800. What is the sampling interval?
Answer and explanation
Correct answer: A. 80
- Step 1: The sampling interval is the population size divided by the sample size.
- Step 2: 4,800 / 60 = 80, so every 80th invoice is selected after a random start.
Answer
80.
Why not the others: 60 is the sample size, not the interval. 4,740 subtracts the sample size from the population instead of dividing. 288,000 multiplies the population by the sample size.
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