Educ 6

1. WHAT ARE THE DIFFERENT
WAYS TO ESTABLISH TEST
RELIABILITY?
BY: JAYREN DIOCOS - LOZANO

2. •1. Variable you are
measuring
•2 Type of test
•3. Number of version of the
test

3. Reliabilit
y
Test -
Retest
Method
Parallel
Form
Split
Half
Method
Internal
Consist
ency
Inter
Rater

4. 1. LINEAR REGRESSION
X - axis
Y - axis
Score 1
Score
2
(Scatter
plot)
5 10 15 20 25 30 35
40
15
20
25
30
35
40
45
50

5. 2. COMPUTATION
OF
Pearson r
Correlation
Correlation Coefficient

6. Monda
y test
Tuesda
y test
X Y
X² Y² XY
10 20 100 400 200
9 15 81 225 135
6 12 36 144 72
10 18 100 324 180
12 19 144 361 228
4 8 16 64 32
5 7 25 49 35
7 10 49 100 70
16 17 256 289 272
8 13 64 169 104
∑X=87 ∑Y=13
9
∑X²=87
1
∑Y²=212
5
∑XY=132
8
Substitute the
value in the
Formula:
r=
10 1328 − 87 139
10 871 − 87 2[10 2125 − 139 2]
r=
𝑛 ∑𝑥𝑦𝑧 − ∑𝑥 ∑𝑦
𝑛 ∑𝑥² − ∑𝑥 2[𝑛 ∑𝑦² − ∑𝑦 2]
r= 0.80

7. 3. DIFFERENCE BETWEEN A POSITIVE AND A
NEGATIVE CORRELATION.
• 0.80 – 1.00 Very strong
relationship
• 0.60 – 0.79 Strong relationship
• 0.40 – 0.59 Substantial / marked
relationship
• 0.20 - 0.39 Weak relationship
• 0.00 – 0.19 Negligible
4. DETERMINING THE STRENGTH OF THE
CORRELATION.

8. 5. DETERMINING THE SIGNIFICANT OF
CORRELATION.
• In order to determine if the correlation is free of certain errors,
it is tested for significance.

9. CRONBACH'S ALPHA :

10. KENDALL’S COEFFICIENT