Vincente Intends to Examine Differences Between Three Groups of District

Multiple Choice

Vincente intends to examine differences between three groups of district curriculum coordinators that received either no formal training, a web-based training, or a cooperative group experience as instruction for the core standards. He tested participants' knowledge of the standards both before treatment and then after treatment. Given his design, which of the following analysis should Vincente conduct?

A) The t test for independent samples
B) The t test for nonindependent samples
C) ANCOVA
D) ANOVA