14.4 An experiment was conducted to determine whether additives increase the adhesiveness of rubber products. Sixteen products were made with the new additive and another 16 without the new additive. The observed adhesiveness was as recorded below.

Temperature (◦C)

50 60 70 80 2.3 3.4 3.8 3.9 Without Additive 2.9 3.7 3.9 3.2 3.1 3.6 4.1 3.0 3.2 3.2 3.8 2.7 4.3 3.8 3.9 3.5 With Additive 3.9 3.8 4.0 3.6 3.9 3.9 3.7 3.8 4.2 3.5 3.6 3.9 Perform an analysis of variance to test for significant main and interaction effects.