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The term statistically valid means a study is able to draw conclusions that are in agreement with statistical and scientific laws. This relies on mathematical and statistical laws.
The best way to make a graph is to draw straight axis lines with a ruler and space the points equally. Finally, plot the points. A cleaner, faster method, can be found by using a spreadsheet software, like excell.
It means to make some hypotheses about an event or events. These should be based on some evidence but all to often people draw conclusions based on prejudices.
an origin can not be drawn because its (0,0) the middle of the graph
A coordinate !