Which statistic is primarily used to draw conclusions about populations?

• A. P-values and Confidence Intervals
• B. Means
• C. Ranges
• D. Frequencies

Answer: (A)

When you want to make statements about a population from sample data, you rely on statistics that quantify uncertainty and potential error. P-values tell you how unlikely the observed result would be if there were no real effect, guiding decisions about whether to reject a null hypothesis. Confidence intervals provide a range around a sample estimate that likely contains the true population parameter with a chosen level of confidence. Together, they form the inferential tools that connect what you observed in the sample to conclusions about the population. Means, ranges, and frequencies describe the data you collected but do not, by themselves, quantify the uncertainty or provide formal population-level inferences.