Memory capacity of9 student was tested before and after training. state at 5% level of significance whether the training was effective from the following across:

Student : 1 2 3 4 5 6 7 8 9

Before : 10 15 9 3 7 12 16 17 4

After : 12 17 8 5 6 11 18 20 3

(Given t 0.5=1.860)