But since this is a sample, it's just an estimate. And just because she sees this positive linear relationship in her sample doesn't necessarily mean that this is the case for the entire population. She might have just happened to sample things that had this positive linear relationship. And so that's why she's doing this hypothesis test. And in a hypothesis test, you actually assume that there isn't a relationship between processor speed and price. So beta right over here, this would be the true population parameter for regression on the population. So if this is the population right over here, and if somehow where it's price on the vertical axis and processor speed on the horizontal axis, and if you were able to look at the entire population, I don't know how many phones there are, but it might be billions of phones, and then do a regression line, our null hypothesis is that the slope of the regression line is going to be zero.