it is the line in the middle of the crosses
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A scatter graph can be used to establish whether or not there is correlation and to get an approximate idea as to its strength. But no graph will actually measure correlation.
A scatter plot.A scatter plot.A scatter plot.A scatter plot.
Never. You can use a column graph, or a scatter graph or even a superimposition of the two but there a column scatter graph does not exist.
You cannot. Or rather, you should not. You do not know if the relationship is linear or something else. A scatter graph is the best way to establish the nature of the relationship. For example, the correlation between x and y, when y = x2 between, say, -4 and +4 is zero (because of symmetry). That would lead you to conclude that there was no relationship. You could not be more incorrect!
A line graph would be what you plot for a function. for example, y = X2. Plotting this will result in a continuous line.A scatter graph will result from measuring a population or an experiment.For example, if you plotted the weight vs height for your class members, you would have a scatter graph.