We want a 95% confidence interval. So we're going to look right over here, 95% confidence interval. We have 10 data points, which means we have 9 degrees of freedom. So 9 degrees of freedom for our 10 data points. We just took 10 minus 1. So if we look over here, for that type, so for a t distribution with 9 degrees of freedom, you're going to have 95% of the probability is going to be contained within a t value of, so the t value is going to be between negative. So this value right here is 2.262.