Personnel in the Materials Engineering Department at Virginia Polytechnic Institute and State University conducted an experiment to study the effects of environmental factors on the stability of a certain type of copper-nickel alloy; the basic response was the fatigue life of the material. The factors are level of stress and environment. The data are as follows

(a) Do an analysis of variance to test for interaction between the factors. Use α = 0.05.

(b) Based on part (a), do an analysis on the two main effects and draw conclusions. Use a P-value approach in drawing conclusions.

Transcribed Image Text:

Stress Level Environment Low Medium High Dry Hydrogen 11.08 10.98 11.24 10.75 10.52 10.43 13.12 13.04 14.18 14.90 15.10 14.15 14.42 13.37 12.73 High Humidity (95%) 12.87 12.95 14.25