Oral Surgery MCQs Bank 2026

Question: You run a 2-variant A/B test on a landing page. What does it mean when the result is statistically significant at p < 0.05?

A. Variant B will increase conversions by at least 5% B. There is less than a 5% chance of seeing this difference (or larger) if there is truly no real difference C. The test has collected enough traffic to stop D. The result will repeat exactly the same way in the next test

Correct answer: B Explanation: A p-value below 0.05 means the observed result would be unlikely if the true difference were zero. It does not guarantee size, repeatability, or that the sample is sufficient.

Question: A data set has extreme high outliers. Which summary is usually more reliable to describe its typical value?

A. Mean B. Median C. Maximum D. Range

Correct answer: B Explanation: The median is resistant to outliers, while the mean can be pulled strongly by extreme values. Maximum and range describe spread, not the typical value.

Question: You are assessing a model classifier. Which metric is most appropriate when false negatives are much more costly than false positives?

A. Accuracy B. Precision C. Recall D. R-squared

Correct answer: C Explanation: Recall focuses on catching as many true positives as possible, which helps reduce false negatives. Accuracy can hide poor performance with imbalanced classes, and R-squared applies to regression.