So this result right here, 1.05 seconds that we got for our 100 rat sample is right over here. Three standard deviations below the mean. Now what is the probability of getting a result this extreme by chance? And when I talk about this extreme, it could be either a result less than this or a result that extreme in the positive direction, more than three standard deviations. So this is essentially, if we think about the probability of getting a result more extreme than this result right over here, we're thinking about this area under the bell curve, both in the negative direction or in the positive direction. What is the probability of that? Well, we know from the empirical rule that 99.7% of the probability is within three standard deviations.