Question
6)About two weeks into the study, some of the teachers in the math-based reading program condition attended an out-of-state conference for kindergarten teachers. Substitute teachers
6)About two weeks into the study, some of the teachers in the math-based reading program condition attended an out-of-state conference for kindergarten teachers. Substitute teachers took over the classes for several days. Although the substitute teachers were also trained with the math-based reading program guidelines, they did differ from the original teacher, with whom the students had become familiar and comfortable. The researchers found that students in the math-based reading program and the control reading programs performed similarly on the PICO post-test at the end of the study. Which internal validity threat is most likely occurring in this scenario?
a.Maturation
b.Regression to the mean
c.Selection
d.Mortality
e.Instrumentation
f.Testing
g.History
h.Interactions
i.Diffusion
j.No Threat
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