Older adults with transitional developmental concerns get little assistance in which of the following services

Statistical test of a non-directional hypothesis is

Consider the following statements :

1. Acquired immune deficiency syndrome seems to have begun in Central Africa
2. AIDS is transmitted through the Human Immunodeficiency Virus (HIV)
3. A person may test HIV-seropositive (HIV +) but be free of AIDS
4. Intensive community-based interventions aimed at risk population will be effective.

Of the statements :

The best technique for selecting a representative sample is

The process of building organizations that ensure the effectiveness of work teams and of their organisations is called

To determine the cluster of more internally homogeneous items to serve as new criteria for item analysis the technique used is