Please answer

If you are testing a hypothesis that morning classes, afternoon classes and evening classes respond to online instruction, on average, in different ways, if n1=27 "mostly morning" classes have xbar1=76 percent final grades, s1=8, n2=33 "mostly afternoon" classes have xbar2=78 percent final grades, s2-14.5 and n3=10 evening classes have mean score of 72 percent, s3=15.5. IF SSTrt=118, calculate MSTrt MSTrt=118(2)=236.0 MSTrt=118/2=59.0 MSTrt=118/3=39.333 MSTrt=118/70=1.686