Test scores Group

N

Mean

SD

t

df

significance

Posttest TAM

WGT

23

23.39

5.09

0.90

44

0.37

WoutGT

23

24.57

3.67

Gain of TAM

WGT

23

15.13

5.10

1.36

44

0.81

WoutGT

23

17.13

4.88