Which branch uses sample data to infer about a population?

Which branch uses sample data to infer about a population?

• A. Descriptive statistics
• B. Inferential statistics
• C. Descriptive and inferential
• D. Statistical modeling

Answer: (B)

Inferential statistics uses sample data to infer about a population. It relies on probability to connect what you observe in a smaller group to what’s true for the larger group, and it provides measures of uncertainty, such as confidence intervals and p-values. For example, surveying 1,000 voters lets you estimate the overall population’s support for a candidate and say how confident you are in that estimate. Descriptive statistics, by contrast, would simply summarize the sample itself—its average, spread, and frequencies—without making claims about a larger population. Statistical modeling is a broad toolbox that can be used for description or inference, but the essential idea of generalizing from a sample to the population is the hallmark of inferential statistics.

Inferential statistics uses sample data to infer about a population. It relies on probability to connect what you observe in a smaller group to what’s true for the larger group, and it provides measures of uncertainty, such as confidence intervals and p-values. For example, surveying 1,000 voters lets you estimate the overall population’s support for a candidate and say how confident you are in that estimate. Descriptive statistics, by contrast, would simply summarize the sample itself—its average, spread, and frequencies—without making claims about a larger population. Statistical modeling is a broad toolbox that can be used for description or inference, but the essential idea of generalizing from a sample to the population is the hallmark of inferential statistics.