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How to accurately draw all lines of best fit for gradient?

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schoolstudent115:
Whenever I am doing a checkpoints question or otherwise, my gradient that I calculate tends to vary a lot with the answer. It could be dead on, or it is 10% off.

Firstly, how do draw lines of best fit with uncertainty bars very accurately? And secondly, how much wiggle room is there for the answer? I’m estimating +/-5%?

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