Rerun the analysis in Exercise 13.29 but treat both variables as fixed and crossed. Show that the SS

Rerun the analysis in Exercise 13.29 but
treat both variables as fixed and crossed. Show that the SS_{school}(code)
in Ex13-31 is the sum of SS_{school} and SS_{school}*code in
this analysis. (Hint: If you run this using SPSS you will have to have both
sets of schools numbered 1–7.)

An educational researcher wanted to test
the hypothesis that schools that implemented strict dress codes produced
students with higher academic performance. She randomly selected 7 schools in
the state with dress codes and 7 schools that had no dress code. She then
randomly selected 10 students within each school and noted their performance on
a standardized test. The results follow.