The second generation of land warfare extended from the Thirty Years' War to the American Civil War

What is the major reason for careful participant selection?

A) It generates clear research hypotheses. B) It reduces statistical errors. C) It improves internal validity. D) It enhances external validity.

Increased use of private firms for the delivery of public services comes in part from a. ideological conviction by some that services should be provided by nongovernmental organizations whenever possible. b. increased governmental ability to pay private organizations for services.c the effort to involve government in service delivery

d. efforts to increase the governmental role in policy development.