Some aircraft have in-flight deicing systems that are designed to prevent or remove ice buildup from the wings. A manufacturer wishes

to compare three different deicing systems. This is done by installing the system on a test aircraft and flying the test aircraft behind a second

plane that sprays a fine mist into the path of the test aircraft. The wings are photographed, and the ice buildup is estimated from interpretation

of the photographs. They make five test flights for each of the three systems. The amount of buildup is influenced by temperature and

humidity at flight altitude. The flights will be made at constant temperature (achieved by slightly varying the altitude); relative humidity cannot be controlled, but will be measured at the time of the flight.

Please briefly describe the design used and give a skeleton ANOVA.