24 n The standard deviations of a, b 1 and b 2 are called standard errors since a, b 1 and b 2 are long run averages (expected values) of what you'd get if you run the regression on lots of different samples from the same population –in much the same way that the mean is the expected value of the population –a, b 1 and b 2 are the sample estimates of the slopes and intercept that you'd get from running a regression on the population
{}