Final answer:
To maximize group effectiveness in decision making and problem solving on an adolescent psychiatric unit, the nurse manager should encourage equal participation among the members.
Step-by-step explanation:
To maximize group effectiveness in decision making and problem solving, the nurse manager on the adolescent psychiatric unit should encourage equal participation among the members. This means that each member should have the opportunity to contribute their ideas and opinions. By doing so, the group can benefit from a range of perspectives and come up with a more comprehensive and effective solution to the problem of unmanageable teenagers.