Suppose that in the experiment described in Example 7, Chapter 12, it is desired to determine also whether there is an interaction between the detergents and the engines; that is, whether one detergent might perform better in Engine 1, another might perform better in Engine 2, and so on. Combining the data in Example 7, Chapter 12, with the following replicate of the experiment, test for a significant interaction and discuss the results.

Data From Example 7

Transcribed Image Text:

Engine 1 Engine 2 Engine 3 Detergent A 39 42 58 Detergent B 44 46 48 Detergent C 34 47 45 Detergent D 47 45 57