Exhibit 10.1: 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.
-Refer to Exhibit 10-1.Suppose the group with vocabulary instruction ends up with statistically higher reading scores than those without vocabulary training.Assuming that there are no problems of internal validity, the teacher should

Question

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If the group with vocabulary instruction ends up with statistically higher reading scores than those without vocabulary training, it means that the null hypothesis (that vocabulary instruction has no effect on reading scores) is not supported. Therefore, the teacher should reject the null hypothesis and conclude that vocabulary instruction does have an impact on reading scores.