Q:
# Why Are Points Connected in a Line Graph but Not in a Bar Graph?

**A line graph is a graph that charts the relationship between two variables or a progression of a single quantity through time.** Without the lines connecting points of data, it would be difficult to make sense of the data being presented if there was no overall trend between the dots. A bar graph, on the other hand, is meant to compare two or more statistics, such as population figures.

Credit:
Jorg Greuel
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Line graphs are used in science and statistics to help make sense of data. For example, a sales department might want a line graph to show the overall increase or decrease in profit from one interval to another. A scientist, meanwhile, might want to study the relationship between a material's electrical conductivity and its temperature. The graph would show heat as the independent variable and conductivity as the dependent variable. By drawing points of data, the scientist could then determine a positive or negative trend; in this case, there would be a positive trend, meaning the line would go up and to the right. The precursor to a line graph is a scatter plot, which simply shows the points of data on the graph before adding a regression line to mark the overall trend.

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Q:
## What Is a Line Graph?

A: A line graph connects points of data with line segments. Line graphs represent how data changes in value over time or some other form of measurement. Full Answer >Filed Under: -
Q:
## What Is a Scattergram Used For?

A: A scattergram or scatter plot defines a relationship between two variables related to cause and effect. According to the American Society of Quality, a sca... Full Answer >Filed Under: -
Q:
## What Is a Horizontal Bar Graph?

A: A horizontal bar graph is a visual representation of data that include a series of horizontal bars representing numerical amounts. Variations in the length... Full Answer >Filed Under: -
Q:
## What Is a Double Bar Graph?

A: A double bar graph is a chart that uses parallel bars at proportional lengths that represent quantitative values. The length of the bar correlates with the... Full Answer >Filed Under: