I have three groups of ten children (A, B and C). They are each have different treatments (the treatments are to do with how they are taught about a certain biological feature). Two scores are calculated: one which uses the results from group A and group C and the other uses the results from group A and group B.
How can I test to see if the differences in the two scores are significantly different?
Each child does not have an individual score/mark.
I'm not sure about using a t-test because the samples are not paired and they are also not independent. Also, I'm not using means so I don't know if that rules out a lot of tests.