Now the third one is independence. And this one actually we can feel pretty good about because Jeff's difference right over here really shouldn't impact David's difference or David's difference really shouldn't impact Kim's difference, especially if they're not observing each other. And let's just say for the sake of argument that they did it all independently in a closed room with a independent observer so they weren't trying to get competitive or something like that. But needless to say, this isn't super robust study, but we can still calculate a 95% confidence interval. So how do we do that? Well, we've done this so many times. Our confidence interval would be our sample mean.