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The following data were obtained from a repeated-measures research study. What is the value of...

The following data were obtained from a repeated-measures research study. What is the value of MD for these data?
Subject 1st 2nd
#1 8 15
#2 6 10
#3 10 5
#4 9 17
#5 7 13




a. 5

b. 6

c. 4

d. 20

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: 2. 4
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