On a plot of A vs B, A is...

Question

BlackTom AI · Accepted Answer

When a graph is labeled "A vs B" it means "A plotted versus B" — A is the quantity being plotted as a function of B. By standard graphing convention the quantity plotted as a function of another is the dependent variable (vertical axis, y) and the quantity it is plotted against is the independent variable (horizontal axis, x).

Relevant knowledge points:
- "X vs Y" or "A vs B" notation: the first item is the dependent variable (plotted on the vertical/y-axis) and the second is the independent variable (plotted on the horizontal/x-axis).
- Dependent variable: changes in response to the independent variable and is shown on the vertical axis.
- Independent variable: is controlled or chosen and appears on the horizontal axis.

Step-by-step reasoning:
1. Read the label "A vs B" as "A versus B" or "A as a function of B."
2. By convention, the variable expressed as a function (the one being measured/observed) is the dependent variable.
3. Graphing convention places the dependent variable on the vertical (y) axis and the independent variable on the horizontal (x) axis.
4. Therefore A is the dependent variable and should be shown on the vertical axis.

Why the correct answer (a) is correct:
- It directly matches the conventional interpretation: A is dependent, vertical axis.

Why the other options are incorrect:
- b: claims A is independent and vertical — conflicts with both the order (A is first, so dependent) and axis convention.
- c: places the dependent variable on the horizontal axis — reverses the usual axis convention.
- d: states A is independent on the horizontal axis — contradicts the "A vs B" ordering where A is dependent.

Conclusion: A is the dependent variable and should be shown on the vertical axis, confirming answer a.

On a plot of A vs B, A is...单项选择题

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