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Your basic choices are bar graph, line graph, pie chart, or scatter plot. BAR GRAPH â This is the most common type for science fair projects. You may select a bar graph when your independent variable is qualitative (categories) or quantitative (numbers). LINE GRAPH â This is the second most common, but frequently used incorrectly, so be careful here. You should only select a line graph if your independent variable is quantitative (numbers) and you hypothesized that the changes in the independent variable would result in changes in the dependent one.
A bar graph, also known as a bar chart, is a graph that uses rectangular bars to represent different values to show comparisons among categories, such as the amount of rainfall that occurred during different months of a year, or the average salary in different states./d5kh2btv85w9n.cloudfront.net/7/7f/Make Bar Graphs Step 1 Version 4.360p.mp4. 1  Another use of rectangular bars on a graph is called a histogram , not bar graph, to display a continuous range of data in increasing or decreasing value in a list of equally divided range segments to show how these compare.