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 resultssource of variancessdfmsfairline383 airport296 errortotal723step 1 of 7: what is the sum of squares for error?