So the null hypothesis is, hey, there's actually no news here that everything is what people were always assuming. And so the null hypothesis here is that, no, the students are getting at least eight hours of sleep per night. And so that would be that, and remember, we care about the population of students, and we care about the population of students at the school, and so we would say, well, the null hypothesis is that the parameter for the students at that school, the mean amount of sleep that they're getting, is indeed greater than or equal to eight hours. And a good clue for the alternative hypothesis is when you see something like this, where they say a statistics class at a large high school suspects, so they suspect that things might be different than what people have always been assuming or actually what's good for students. And so they suspect that students at their school are getting less than eight hours of sleep on average. And so they suspect that the population parameter, the population mean for their school is actually less than eight hours. And so if you wanted to write this out in words, the average amount of sleep students at their school get per night is less than eight hours.