Dependent variable
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No. When you draw a best line of fit on the scattered plot, the line would not be straight.
No, that would be quite unusual if if did, although not impossible.
Bar graph.
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