A population contains 2,000 units, and a sample of 100 units is required. In systematic sampling, the sampling interval is:
Correct answer: B. 20
- A. 10
- B. 20
- C. 100
- D. 200
Explanation
The sampling interval is calculated as N divided by n, so 2,000 divided by 100 equals 20. After a random starting point, every twentieth unit is selected.
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Sampling covers population and sample, sampling frames, simple random, systematic, stratified, cluster and convenience methods, along with sampling and non-sampling errors. Estimation includes sample statistics, population parameters, point estimates, confidence intervals and margins of error, with attention to how sample size affects precision.
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