showing data and seeing if it's closely related or not related at all
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A scatter graph can be used in companies to plot things such as profit and loss for certain items (or the company as a whole) over time, which can give the company a good insight to what sells well and a guideline of what they could do to increase profit.
Bar graph.
Dependent variable
A correlation exists in a scatter plot if there is a general trend in the outputs as inputs increase. If the outputs generally increase in value, then there is a positive correlation. If the outputs generally decrease in value, then there is a negative correlation.
line of best fit