A researcher aims to evaluate a new method of teaching fractions to third graders. What type of nonequivalent groups design could be best for this study? A researcher aims to evaluate a new method of teaching fractions to third graders. What type of nonequivalent groups design could be best for this study? Interrupted Time-Series Design with Nonequivalent Groups Posttest Only Nonequivalent Groups Design Switching Replication with Treatment Removal Design Pre-test/Post-test Nonequivalent Groups Design