If the sample size is increased from 100 to 400 while other conditions remain unchanged, the standard error of the sample mean becomes:
Correct answer: B. Half as large
- A. Twice as large
- B. Half as large
- C. Four times as large
- D. Unchanged
Explanation
Standard error varies inversely with the square root of sample size. Increasing the sample size fourfold increases the square root fourfold, so the standard error becomes half as large.
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