G2 Gas Fitter Practice Exam

What type of graph shows the relationship between two or more related variables starting at a baseline?

1. A pie chart

2. A line graph

3. A bar graph

4. A scatter plot

The correct answer is: A bar graph

The correct choice focuses on how the graph represents relationships over time or other continuous variables. A bar graph is primarily used to compare discrete quantities, showing the magnitude of different categories rather than illustrating trends or changes over time from a baseline. In contrast, a line graph effectively shows the relationship between two or more related variables, particularly over a specific time period. It starts at a baseline and connects data points with lines, allowing for easy visualization of trends, patterns, and fluctuations. This makes it particularly useful for analyzing how one variable may depend on another. While a pie chart displays proportions of a whole and is not suited for showing relationships or change, and a scatter plot visualizes the correlation between two variables without a clear baseline progression, the line graph is explicitly designed for the type of analysis described in the question. Thus, it is the most appropriate choice for depicting the relationship between related variables starting at a baseline.