I have some data (multiple choice question scores for two groups of medical students exposed to an experimental and standard type of anatomy teaching). It's ordinal data (scores out of 10). I'd like to test whether the experimental type of teaching is equivalent (i.e. not inferior) to the standard teaching type. An acceptable delta (error) would be one mark in the MCQ test.
Now I am not the greatest statistician in the world - I understand how to show superiority with Fisher as applied to contingency tables but really am not sure what I'm doing with equivalence. Do I do two one-tailed Fishers? Or one two-tailed but somehow altered to have a null hypothesis in which there IS a difference? I'd be really grateful if someone could give me concrete steps as to how to calculate this - I've googled it like crazy and only confused myself further.
Thank you all in advance for your suggestions!
Tim
Now I am not the greatest statistician in the world - I understand how to show superiority with Fisher as applied to contingency tables but really am not sure what I'm doing with equivalence. Do I do two one-tailed Fishers? Or one two-tailed but somehow altered to have a null hypothesis in which there IS a difference? I'd be really grateful if someone could give me concrete steps as to how to calculate this - I've googled it like crazy and only confused myself further.
Thank you all in advance for your suggestions!
Tim