The data are described as having measurements of a single variable per subject; what is this data called?

• A. Observations
• B. Data capture
• C. Data set
• D. Univariate data

Answer: (D)

When you have measurements of a single variable for each subject, you’re looking at univariate data. The key idea is that only one attribute is being measured across all individuals—like height, temperature, or test score. You study its distribution across subjects using simple summaries (mean, spread) and visuals (histograms, boxplots). If you measured more than one attribute per subject, such as both height and weight, that would be multivariate data. Observations refers to the individual data points themselves, not the number of variables, and a data set is just a collection of data points without specifying how many variables are involved.