Also, when you think about biological processes, like how well someone snaps, which is a product of a lot of things happening in a human body, and it's the sum of many, many processes, those things also tend to have a roughly normal distribution but I won't go into too much depth there. But all of these things, once again, this isn't a super robust study, but this is a fun thing for friends to do if they have nothing else to do. All right. 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.