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A line graph shows change over a period of time.
when the points on the graph are close to each other;)
bar graph
A bar graph is information that is collected by counting can be displayed on this graph. A pie graph is a graph that shows information as parts of a circle
When both axis' are increasing it is a positive correlation. When both are decreasing it is a negative correlation. When the dots are all over the place then there is no correlation.