In a study designed to examine the effects of an intensive reading program, Vaughn et. al 2009) screened 2nd grade students and separated good readers from poor readers. The poor readers were given the intervention treatment. At the end of 26 weeks of intervention significant improvement in the poor readers was noted. What type of experimental design was employed in this study?
A) regression discontinuity
B) nonequivalent comparison group
C) interrupted time series
D) median split design

Question

Quizplus · Accepted Answer

The study used a regression discontinuity design, as it involved assigning participants to treatment based on a cutoff score (good vs. poor readers) and then measuring the effect of the intervention on those below the cutoff.

In a Study Designed to Examine the Effects of an Intensive