You operate a travel advisory website, and want to give your users advice on airline timeliness. You select 3 airlines, and monitor their delays at 5 airports. You record average delay times for each airline, at each airport. Then, you run a 2-way ANOVA and get the following partial Result ANOVA Results
Source of Variance SS df MS F
Airline 355
Airport 283
Error
Total 638
What is the Sum of Squares for Error?