Today we'll discuss the Student-T distribution, a useful concept if we are finding a confidence interval for the population average of a bell-shaped distribution but only have a small sample size (less than 30, say). We recall that our bootstrapping methodology is more generally applicable: it produces a confidence interval no matter what the shape of the underlying distribution, though it too works best if we have a fairly large number of samples. For next class, please read the introduction and the first two sections of chapter 15 and complete the reading quiz.