An experiment was conducted to compare four different preschool curricula that were adopted in four different classrooms. Reading readiness proficiency was used as a blocking variable (below proficient, at proficient, above proficient). The mean scores on the dependent variable, letter recognition, are listed here for each cell. The intention of the treatment (i.e., the curriculum) is to increase letter recognition.
Use these cell means to graph the interaction between curriculum and reading readiness proficiency.
a. Is there an interaction between type of curriculum and reading readiness proficiency?
b. What kind of recommendation would you make to teachers?