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I am sorry if this is a naive question, but I wanted to have your suggestions before considering anything. Suppose I have a group of "n" students and I have their score in three courses: A, B, and C. If the scores are not on the same scale, I can standardize them before comparison. For comparing the mean difference between two courses I could have done the Paired-T test, but I am not sure about the extension of paired T-test for comparing more than two means for dependent data. Any ideas? Thanks in advance!

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    $\begingroup$ Try the two-way ANOVA. Testing three paired-T test is not appropriate here. $\endgroup$
    – xjf
    Feb 2, 2017 at 22:46
  • $\begingroup$ If you standardize the grades within course, all courses will have a mean of zero. Obviously, then, there will no difference between courses in mean score. $\endgroup$
    – Joel W.
    Feb 3, 2017 at 0:28
  • $\begingroup$ @Jianfeng Could you please explain what will be the factors for two-way ANOVA? $\endgroup$ Feb 3, 2017 at 15:29
  • $\begingroup$ @JoelW. Thank you for pointing that out. By standardize I meant I will convert all the scores under the same scale (eg. score out of 100) $\endgroup$ Feb 3, 2017 at 15:31
  • $\begingroup$ @curiousmind, one factor is course and the other factor is student, since the scores from the same student are correlated. $\endgroup$
    – xjf
    Feb 3, 2017 at 16:29

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A simple and intuitive solution is to just do three different paired t-tests and then correct for multiple comparisons using bonferroni correction. Approximately this means you just divide your alpha level with the number of comparisons you are doing.

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