Subject	Pretest score	Posttest score
1	30	29
2	28	30
3	31	32
4	26	30
5	20	16
6	30	25
7	34	31
8	15	18
9	28	33
10	20	25
11	30	32
12	29	28
13	31	34
14	29	32
15	34	32
16	20	27
17	26	28
18	25	29
19	31	32
20	29	32
