Find the Grand Mean (GM): Total Sum of Squares (SST), Sum of Squares Between groups (SSB), Sum of Squares Within groups (SSW) and the F Ratio: Two separate after-school programs for at-risk teenagers have been implemented in the city of Redland. One is a big-brother/big-sister mentoring program, in which adult volunteers are paired with troubled teenagers. The second involves extracurricular team sports competitions. In terms of the percentage change in crimes reported to the police over a one-year period, were the programs successful? The results are for random samples of 18 neighborhoods drawn from the entire city.

Program Type	Change in Crime Percentage
Mentoring	-10
Mentoring	-20
Mentoring	+10
Mentoring	+20
Mentoring	-10
Mentoring	-10
Competition	-21
Competition	-15
Competition	-80
Competition	-10
Competition	-20
No Program	+30
No Program	-10
No Program	+14
No Program	+80
No Program	+70
No Program	-50
No Program	+50
No Program	+10