All the following government services are difficult to measure except

The two dimensions of a frequency polygon are represented by

A) Height and length. B) Length and width. C) The amygdala and the ordinate. D) The ordinate and the abscissa.

Which of the following would not be considered a field experiment?

a. effects of computer-based instruction on computing confidence in a teacher training program b. effects of music on laboratory memory performance among introductory psychology students c. effects of self-selected incentives on productivity among auto workers d. effects of television violence on playground aggression among kindergarteners.