2. RELIABILITY refers to the
consistency of a test in measuring
whatever it measures. It is the
degree to which a test will yield
similar or comparable results for
the same students when
administered at different times.
This is usually measured through
the computation of a reliability
coefficient.

3. TEST – RETEST METHOD
Test reliability is determined from
the repetition of the same test.
Thus, a test is administered
twice. Scores obtained by the
students in both test
administration are rank ordered
and a rank correlation coefficient
is obtained with the use of
Spearman Rho.

4. STUDENT SCORES – FA SCORES - SA
1 33 29
2 28 26
3 44 42
4 36 30
5 26 28
6 35 35
7 42 39
8 40 41
9 20 20
10 28 28

5. Ss-FA
X
Ss-SA
Y
RANK
X
RANK
Y
D D
33 29 6 7 1 1
28 26 7.5 10 -2.5 6.25
44 42 1 1 0 0
36 30 4 6 -2 4
26 28 9 8.5 0.5 0.25
35 35 5 5 0 0
42 39 2 4 -2 4
20 40 10 3 7 49
28 28 7.5 8.5 -1 1
SD2 =
62.5