Internal criterion | External criterion | N | r | p | r 2 |
---|---|---|---|---|---|
Convergent validity | |||||
TESS item 1 | Short Scale of Intrinsic Motivation [31] | 1333 | .52 | <.001 | .27 |
TESS item 2 | Perceived Usefulness Scale [32] (German translation) | 1377 | .57 | < .001 | .32 |
TESS item 3 | Cost# | 1380 | −.34 | < .001 | .12 |
Discriminant validity | |||||
TESS score | Repetition scale of the LIST [34] | 1195 | .06 | <.05 | .00 |