In a histogram, used to give a graphical display of a distribution of sample data, what does the X axis represent?

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The question asks about what the X axis represents in a histogram, which is a graphical display of a distribution of sample data.
In a standard histogram, the horizontal axis (X axis) corresponds to the data values themselves or to the class intervals (bins) into which the data are grouped. Each bin represents a range of values, and the height of the bar above that bin on the Y axis shows the frequency (or relative frequency, or density) of observations that fall into that bin.
Because there are no answer options provided in the prompt, we can still reason about common possibilities: if an option says 'the observed value(s) or measurement values,' that aligns with the idea that each bin covers a range of values rather than a single exact observation, and the axis labels typically reflect the value scale (e.g., measurement ranges like 0–10, 10–20, etc.). If an option suggested that the X axis shows 'frequency' or 'count,' that would be incorrect because frequency is typically represented on the Y axis. If an option claimed the X axis shows 'probability density' without context, that would be incomplete because density can be on the Y axis, while the X axis still depicts the value scale or bin boundaries.
In practice, the X axis is the practical data-interval axis: it labels the bin edges or the values that define those bins, enabling you to read how many observations fall into each value range.

PSYC20007_2025_SM2 Goals of Statistical Testing I

In a histogram, used to give a graphical display of a distribution of sample data, what does the X axis represent?

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