Why was a line graph used to summarize the experimental results?

• A. Line graphs are best for comparing discrete categories.
• B. Line graphs are used to represent continuous data.
• C. Line graphs show qualitative descriptions.
• D. Line graphs are always preferred for any data.

Answer: (D)

Line graphs are used to summarize experimental results because they show how a measurement changes continuously as another variable changes, usually over time. Connecting the data points with a line lets you see trends, direction, and the rate of change, making it easy to spot whether the results rise, fall, or stay steady and where there may be patterns or cycles. This makes them particularly useful when the data come from measurements on a continuous scale rather than distinct categories. Other graph types are more appropriate when you’re comparing separate groups (categories) or describing qualitative aspects, and no single graph type is inherently best for every dataset.