When and how do I use or input maximum and minimum gradients

[akr1]

I have to do several labs, but I have no idea when and how to use maximum and minimum gradients and how to apply them... Please some help?

[Rigel]

Right, you have to find the maximum and minimum gradients to find the uncertainity in the gradient of the graph.

But how can you get the value of the maximum and minimum gradient?

Say, we have two data points. (0.5, 0.6) and (0.6,0.7). The uncertainity in the y values is 0.05.

Then, if you want to find the minimum gradient, find the maximum value for y in the FIRST data point, and then the minimum value for y in the LAST one. (0.5,0.65) and (0.6,0.65), then find the equation of the best-fit line using Excel. After that, find the maximum gradient, the minimum value for y in the FIRST data point, and the maximum in the LAST one. (0.5,0.55) and (0.6,0.75), then find the equation of the best fit line.

After that, find the diference of the gradients, and then divide it between two. That's the uncertainity in the gradient.

Sorry if the explanation isn't too clear, but i hope you get the idea. PM me if you have any more doubts.