If the confidence level for an interval estimate is raised from 90 percent to 99 percent, while the sample size and variability remain fixed, the interval generally becomes:
Correct answer: A. Wider around the estimate
- A. Wider around the estimate
- B. Narrower around the estimate
- C. Unchanged in its width
- D. Centered at zero automatically
Explanation
A higher confidence level requires a larger critical value, so the margin of error increases. Therefore, the interval becomes wider when other conditions remain unchanged.
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