Hello,
I am trying to figure out what test to use in order to solve a fairly basic concept. I am not sure if this is a cenvergence test or a significance test.

Example: Consider the following data

x y
1 30
2 22
3 18
4 12
5 10
6 9
7 8
8 6
9 5.5
10 5.8

I want to know at what x does the series of data start to become not significantly changing any more. If I simply know what type of test to be using, I think I am capable of solving my problem.

Thank you for your help!