For a ratio measure, the 95% confidence interval did NOT cross 1 and the p value was <0.05. Which statement about confidence intervals is most accurate?

Correct answer: B. A narrower interval reflects greater precision and a more reliable estimate

• A. Backwards. A wider interval means LESS precision and a less certain estimate, not more significance.
• B. Correct. A narrower confidence interval reflects greater precision. Here the CI excludes the null value (1) and p<0.05, so the finding is statistically significant.
• C. They agree, not contradict: a CI that excludes the null (1 for ratios, 0 for differences) corresponds to p<0.05, which is exactly what was found.

Note: This item was poorly transcribed in the source. Key concept: CI excludes null → significant; narrower CI = more precise.