This is some threshold t value right over here. We want a threshold t value such that any t value less than that, or the probability of getting a t value less than that is 1%. That entire area in yellow is 1%. We need to figure out a threshold t value there. This is for a t distribution that has n equal to 10, or 10 minus 1 equals 9 degrees of freedom. What is that threshold value over there? Notice that this is a one-sided distribution.