A pie chart shows the ___________________

Question

BlackTom AI · Accepted Answer

When interpreting a pie chart, we focus on how the data are distributed across categories and express those portions as fractions of the whole.
Option 1: 'relative frequencies of a quantitative variable.' This is incorrect because pie charts are used for categorical (qualitative) data, not quantitative (numerical) data. Quantitative variables are typically represented by histograms or boxplots rather than pie charts.
Option 2: 'frequencies of a nominal variable.' While this option mentions a qualitative concept, it specifies 'frequencies' (counts) rather than 'relative frequencies' (percentages or proportions). A pie chart emphasizes proportions of the whole, not raw counts, so this phrasing is misleading about what the visualization shows.
Option 3: 'frequencies of a ratio variable.' A ratio variable is a quantitative variable with a true zero, and pie charts do not depict its frequencies; they depict relative shares of categories, not numerical frequencies of a ratio-scaled variable.
Option 4: 'relative frequencies of a qualitative variable.' This correctly describes a pie chart’s purpose: it displays how large each category’s share is of the total, using relative frequencies (percentages or proportions) for a qualitative/categorical variable.

A pie chart shows the ___________________单项选择题

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