How does sample size affect the width of a confidence interval?
- Increasing the sample size decreases the width of the confidence interval
- Increasing the sample size has no effect on the width of the confidence interval
- Increasing the sample size increases the width of the confidence interval
- The relationship between sample size and the width of the confidence interval is unpredictable
Increasing the sample size decreases the width of the confidence interval. The larger the sample size, the more information you have, and thus the less uncertainty (which translates into a smaller standard error and narrower confidence interval).
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