To what extent were the teaching changes effective in changing patterns of student learning?

I was really happy to notice shifts in attitude of my target group towards writing. I graphed the  data obtained from their easTTle writing,  as  this is a consistent  way of gathering data, and it's  evident that the data shows that improvement.

STUDENT	T1	T2	T3	T4
Student 1	1	3	3	3
Student 2	2	3	4	4
Student 3	1	4	4	4
Student 4	2	4	3	3
Student 5	1	1	4	0
Student 6	3	4	1	4

I am good at writing
STUDENT	T1	T2	T3	T4
Student 1	2	3	3	3
Student 2	2	3	3	3
Student 3	1	4	4	4
Student 4	2	3	3	3
Student 5	1	1	3	0
Student 6	4	4	2	4

My teacher thinks I am good at writing
STUDENT	T1	T2	T3	T4
Student 1	3	3	3	3
Student 2	2	3	3	4
Student 3	1	4	4	4
Student 4	2	4	4	4
Student 5	4	3	4	0
Student 6	3	4	3	4

My mum and dad think I am good at writing.
STUDENT	T1	T2	T3	T4
Student 1	3	4	3	4
Student 2	3	4	3	4
Student 3	1	4	3	4
Student 4	2	4	4	4
Student 5	4	1	3	0
Student 6	3	3	4	4

I enjoy writing in my own time.
STUDENT	T1	T2	T3	T4
Student 1	1	3	3	3
Student 2	4	2	3	4
Student 3	1	4	3	4
Student 4	2	4	4	4
Student 5	1	1	4	0
Student 6	4	3	3	4

I am good at spelling.
STUDENT	T1	T2	T3	T4
Student 1	4	3	3	4
Student 2	3	2	3	4
Student 3	1	4	4	4
Student 4	3	4	4	4
Student 5	1	1	1	0
Student 6	4	4	4	4