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In an experiment, the observations always have some kind of random error. It could also be that the relationship between the variables is such that it can't be represented by a smooth line.

If the data points do form a perfectly smooth line, you have probably 'cooked' the results, and it will be obvious that you haven't performed the experiment!

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11y ago
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Q: Why isn't necessary for all of the data points to be on the drawn line of the graph?
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