For a fixed sample size, which change generally reduces the margin of error of an estimate?
Correct answer: B. Using a lower confidence level
- A. Using a higher confidence level
- B. Using a lower confidence level
- C. Using a larger population variance
- D. Removing random selection from sampling
Explanation
A lower confidence level uses a smaller critical value and therefore produces a smaller margin of error, assuming the sample size and variability remain fixed. Increasing confidence or variability generally makes the margin of error larger.
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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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