I want you to solve this in Excel and in DataFit.
Right click on the curve fit on the plot, click the set intercept checkbox, and set it equal to zero to remove the y-intercept.
Then in DataFit, use Define User Model to define a model Y = slope*X, and refit the data in DataFit.
The error in the y-intercept is bigger than the y-intercept itself, so it isn’t necessary.
Once you do the revised DataFit, you will find that the slope is 473 +/- 8, instead of 470 +/- 20 (after significant figures are applied from the original 474 +/- 18).
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