Error Analysis, remind me!

[JungleJim]

serious brain fade as I haven't done this since uni.

have an experimental data set, x vs y, linear relationship. Both x and y contain error.

the answer i want is dx/dy, but i want to also express the error.

so, plot x vs y, line of best fit added.

then what do i do?

[spikeyhead]

find the standard deviation of the data points from the best fit line

[JungleJim]

I want the error in the computed gradient, so i'm not sure how to apply what you say.

:-(