An educational psychologist compares the reading progress of children who have been diagnosed with dyslexia against those who have not. Which of the following statements is true of this study's design?
It is a field experiment because the reading progress is measured in the children's natural school environment.
It is a quasi-experiment because the independent variable is a pre-existing participant characteristic.
It is a natural experiment because the researcher has no control over the occurrence of dyslexia.
Participants must be randomly allocated to either the dyslexia or non-dyslexia group to ensure high internal validity.
