Question

What advantage does a line graph have over a bar chart?

Answer 1

Advantages
-Line graphs are best to show trends over time
-Show relationships between 2 or more variables
-Good visual impression of trends and changes
-Can show positive and negative values
-Simple to construct and read

Answer 2

The preference of one chart over the other depends upon the number of data points that must be plotted. If you have to plot many data points, you may consider using a line graph. However, for lesser number of data points, a bar chart is a better idea.

A line graph is preferred when you want to compare changes in over one group in the same time period.

A bar graph or chart helps to make a comparison among various groups or keep a track of changes over different periods of time.