## Question 315:

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

Need help with the concepts in this question ? View the Comparing Two Means: 2 Sample t-test Tutorial.