(Z score)
To compare two scores that have different mean and different
standard deviation (SD).
Taro had received a score of 80 on a test. The average was 50, and
standard deviation was 15.
Susan had received a score of 75 on a test. The average was 60,
and standard deviation was 10.
Z =
ZTaro =
ZSusan =
= 2.0
= 1.5
The distance of a score from the mean of the variable expressed in
standard deviation unit.
50 80
60 75
0 1.5
2.0
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