Researchers were interested in assessing whether stress levels are different at the beginning of the semester compared to finals week. To test this, stress was measured in 5 students at the start of the semester and then again at the end of the semester during finals week.      Participant Stress 1 Stress 2 Difference Score (Di) 1 22 22 0 2 32 34 -2 3 24 25 -1 4 28 30 -2 5 26 29 -3     What is the mean difference (Mdiff)? Round to 2 decimal places.

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A: The table below shows the frequency of AP Biology scores for a high school class.

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