A third grade teacher feels that vocabulary instruction will help her children improve their reading scores. Half of her class receives vocabulary instruction, while the other half has a library period. She will compare reading scores after four months. The external validity question in this study would be:
a. is vocabulary instruction worth the time it involves?
b. was vocabulary instruction really responsible for the observed difference in reading scores?
c. would vocabulary instruction improve reading scores for all third graders?
d. should the teacher have exposed all the students to vocabulary instruction?
C
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