the following data were obtained from a repeatedmeasured stu

the following data were obtained from a repeated-measured study, what is the value of MD?

Subject 1st 2nd

1 8 15

2 6 10

3 10 5

4 9 17

5 7 13

a) 4

b)6

c) 20

Mean of 1st series is (8+6+10+9+7)/5=40/5=8

Mean of 2nd series is (15+10+5+17+13)/5=60/5=12

So, MD=Mean of 2nd series-Mean of 1st series

=12-8

So, option is (a).