I am trying to calculate the confidence interval for this problem using my T-84, and it's driving me mad because I'm so close to the correct answer. The problem is 1. The problem statement, all variables and given/known data The answer to this problem is (22769.83, 30059.41) (This is an example problem.) When I try to duplicate this in my calculator, my answer is (22772,30058). 2. Relevant equations I go to STAT>TESTS>7>STATS 3. The attempt at a solution I put the data in like this standard deviation: 8150 mean: 26414.62 n: 20 C-Level: 0.9544 Could someone tell me what I'm doing incorrectly, please.