Final answer:
The type of research design is a randomized controlled experiment, where different classrooms were randomly assigned to different conditions. The researcher collected descriptive data on the students, as well as data on the programs implemented and the students' performance.
Step-by-step explanation:
The type of research design in this scenario is a randomized controlled experiment.
In this study, the researcher randomly assigned one first-grade classroom and one second-grade classroom to each of three conditions: Condition A, Condition B, and Control. The independent variable is the different programs implemented in each condition, and the dependent variable is the performance or outcomes of the students.
The researcher collected three different types of data: descriptive data on the students (gender and race), data on the programs implemented, and data on the students' performance or outcomes.