Tomas had trouble finding people to include in his study, so he asked for volunteers and promised to pay them each five dollars. What is wrong with this approach?\ He should have just asked for volunteers and not paidftrem.\ He may get too many responses and have to choose.\ The volunteers may be biased or differ from the general population.\ He should have paid them more to get more committed subjects.

Tomas had trouble finding people to include in his study, so he asked for volunteers and promised to pay them each five dollars. What is wrong with this approach? He should have just asked for volunteers and not paidftriem. He may get too many responses and have to choose. The volunteers may be biased or differ from the general population. He should have paid them more to get more committed subjects