The following data resulted from an experiment to compare three burners, B1, B2, B3. A Latin square design was used as the tests were made on three engines and were spread over three days.

Engine 1 Engine 2  Engine 3

Day 1 B1 16 B2 17  B3 20

Day 2 B2 16 B3 21  B1 15

Day 3 B3 15 B1 12  B2 13

Test the hypothesis that there is no difference between the burners.