An engineer is studying the mileage performance characteristics of five types of gasoline additives. in the road test he wishes to use cars as blocks; however, because of a time constraint, he must use an incomplete block design. he runs the balanced design with the five blocks that follow. analyze the data from this experiment (use α-0.05) and draw conclusions.

car

additive 1 2 3 4 5

1 17 14 13 12

2 14 14 13 10

3 12 13 12 9

4 13 11 11 12

5 11 12 10 8