So we get, we're going to take the square root of 4.67 squared, divided by 100, plus 4.04 squared, divided by 100, and then close the parentheses, and we get.617. So this is equal to, let me write it right here, this is going to be equal to 0.617. So if we go back up over here, we calculated the standard deviation of this distribution to be 0.617. So now we can actually calculate our interval, because this is going to be 0.617. So if you want 1.96 times that, so we get 1.96 times that.617, I'll just write the answer we just got, so we get 1.21. So this is, this number right here, this number right here is 1.21. So the 95% confidence interval is going to be, is going to be the difference of our means, 1.91 plus or minus this number, 1.21.