Which one of the following scenarios for group assignment represents a true experiment?
A) Two pre-existing classes randomly assigned to two different teachers.
B) Three pre-existing classes randomly assigned to three different treatments.
C) Sixty patients assigned to the same treatment on randomly alternating weeks.
D) Sixty police precincts assigned at random to two different policing strategies.

Question

Quizplus · Accepted Answer

True experiments require the random assignment of subjects to different conditions or treatments. In option D, sixty police precincts are randomly assigned to two different policing strategies, which meets the criteria for a true experiment by ensuring that any differences observed between the groups can be attributed to the treatment effect rather than pre-existing differences.

Which One of the Following Scenarios for Group Assignment Represents