I'm doing my master thesis about non material motivation factors and i want to see if there is significant difference between two age groups. I have 16 factors, when I do statistics in SPSS i got results separately. For each of those variables (16 results). 8 od 16 show significant difference. But my hypothesis is to see if there is difference in non material factors for two groups. So I need one result. I made new variable by conputevariable (all/16). On that way s. difference is very strong (p<0.001) but how is it possible if i watch them separately, only 8 of them are significant. Have I done something incorrectly?