The precision with which a sample average approximates a population average increases as:
Correct answer: D. the standard deviation of the sample decreases
- A. the range of the sample increases
- B. the standard deviation of the sample increases
- C. the man of the sample increases
- D. the standard deviation of the sample decreases
Explanation
A sample mean estimates the population mean more precisely when scores vary less, because a smaller standard deviation reduces sampling error. In practice, a larger sample also improves precision, but that option is not provided.
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