It's actually a surprisingly pleasant-sounding car alarm. It sounds like a slightly obnoxious bird. Anyway, her experiment is, the way I described it, 25 days she would take bus A, 25 days she took bus B, and she would record all the travel times. Let's say that I just have 25 data points in each column. Let's say you get 12 minutes, 20 minutes, 25 minutes, and you just keep going. There's 25 data points. Let's just say that there are 12 data points less than 20 minutes and 12 data points more than 20 minutes.