**1. The problem statement, all variables and given/known data**

Hi. I don’t know if this is the right place to talk about my problem. Anyway, here it is:

I’ve made a classic experiment to find g. For that I used a gravitational pendulum and measured several periods of oscillation for differentes values of L.

After that, i made a linear regression and using the slope i got g.

Now I have to estimate a value for the uncertainty of the value of g that i obtained.

The thing is. I have to consider several different uncertainties!: uncertainty of L, uncertainty of T, reaction time and the uncertainty on linear regression (that was made "by eye").

How do I get all this together to get a single value of uncertainty?? How do i even get the value for the uncertainty on linear regression?

I would be very appreciate if someone could help me!!

Thanks guys!

**2. Relevant equations**

No idea!!

http://ift.tt/1kHWUww