GED Math Practice Test

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What type of graph is used to show the relationship between two numerical variables on an x-axis and a y-axis?

Bar graph
Line graph
Pie chart
Table

The correct answer is: Line graph

The correct choice, a line graph, is ideal for showing the relationship between two numerical variables plotted along the x-axis and y-axis. Line graphs are particularly useful for illustrating trends over time, making them effective for displaying continuous data. Each point on the graph represents a data pair, allowing for easy visualization of how changes in one variable are associated with changes in another. A bar graph, on the other hand, is generally used for comparing categorical data rather than displaying the relationships between continuous numerical variables. A pie chart is best suited for showing parts of a whole and would not effectively depict relationships between two variables. A table presents data in organized rows and columns but does not visually depict the relationship between variables like a line graph does. Thus, a line graph is the most suitable choice for this type of analysis.