This end and this end will be fatter than in a normal distribution. And then we want to find an interval. So this is a normalized t distribution. The mean is going to be 0. And we want to find an interval of t values between some negative value here and some positive value here that contains 95% of the probability. So this right here has to be 95%. And to figure what these critical t values are at this end and this end, we can just use a t table.