Dr. Marjee conducts a test of hypothesis to determine if students who study late at night differ in GPA from students who study in the early morning. Their research design and data are appropriate for a two independent samples t test. The research team surveys students and records their GPAs. The sample sizes were: Late night study, n = 93. Early morning study, n = 84. (Degrees of freedom are calculated exactly as described above whether or not the sample sizes are the same.)  What is the total degrees of freedom for this test? Please explain steps if possible

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