Just add these up, divide by 10. And our sample standard deviation here is 2.98. So the t statistic that we can derive from this information right over here, so let me write it over here. The t statistic that we can derive from this. And you can view this t statistic as being a random sample from a t distribution. A t distribution with 9 degrees of freedom. So the t statistic that we can derive from that is going to be our mean, 17.17, minus the true mean of our population.