Question

Two aircraft engine models were tested by running them until they needed to be stopped for essential maintenance. More specifically, 5 of each of the two engine models were tested, and the total number of hours (in thousands) is given in the table below.

Model1	29.2	23.5	15.1	45.3	26.6
Model2	40.0	39.5	39.9	34.2	40.8

Calculate a 90% confidence interval for the difference between the average running times.

Answer 1