Teachers at School A were given a substance abuse knowledge test.During the next four months,the teachers attended training sessions in substance abuse.They were then given the knowledge test again.Teachers at School B were given the substance abuse knowledge test,and four months later,they were given the test again.What kind of design was used?

A) pretest-posttest true experimental design
B) nonequivalent control group pretest-posttest design
C) control time series
D) matched comparison group pretest-posttest design

Pretest-Posttest

A research design where measurements are taken both before and after a treatment or intervention to assess its effects.

Nonequivalent Control

A research design where the control group is not randomly assigned, making it different in certain ways from the experimental group, which can affect the interpretation of results.

Control Time Series

A method in statistics and research that involves collecting data points from a single group or subject over a period of time to identify trends or effects of interventions.