So we have 2.776 as our critical value, and then times our sample standard deviation, well, the sample standard deviation for our difference is right over here is 1.64. And then we're going to divide that by the square root of our sample size. So the square root of our sample size, we already wrote a five in there. Sometimes I just write an N there. And so what is this going to be equal to? First, let's calculate just the margin of error right over here. So this is going to be 2.776 times 1.64 divided by the square root of five.