An engineer in an automotive factory wishes to know what the tire pressure is on all cars leaving the factory. She measures the tire pressure on a sample of 10 randomly selected cars as they are about to leave the plant, in psi. The results are:
32.1
32.3
32.0
30.9
31.5
32.4
32.9
33.1
32.2
31.4
Calculate a 95% Confidence Interval on these numbers