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    a. t cannot be computed because at least one of the groups is empty. SPSS

    Hi there, I've been unable to run an independent t stats on the following data and I couldn't fix the problem. Both variables are set to Numeric and the First(Section) is Nominal while QuizGrade is Scale Section QuizGrade 1.00 100.00 1.00 33.00 1.00 92.00 1.00 33.00 1.00 98.00...