So the last thing we have to do is figure out what is this critical t value? You can figure it out using either a calculator or using a table. I'll do it using a table, and to do that, we need to know what the degrees of freedom. Well, when you're doing this with a regression slope like we're doing right now, your degrees of freedom are going to be the number of data points you have minus two so our degrees of freedom are going to be 20 minus two which is equal to 18. I'm not gonna go into a bunch of depth right now. It actually is beyond the scope of this video for sure as to why you subtract two here, but just so that we can look it up on a table, this is our degrees of freedom. So we care about a 95% confidence level.