Dr.Knowles wants to assess the effectiveness of Ritalin,a drug used to treat hyperactivity and inattention.At the beginning of the school year,he administers a test of cognitive skills to two groups of children who are on the medication: third-graders and fifth-graders.He retests both groups at the end of the first semester and at the end of the school year.Dr.Knowles is using a __________ design.

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The Answer of Dr.Knowles wants to assess the effectiveness of Ritalin,a drug used to treat hyperactivity and inattention.At the beginning of the school year,he administers a test of cognitive skills to two groups of children who are on the medication: third-graders and fifth-graders.He retests both groups at the end of the first semester and at the end of the school year.Dr.Knowles is using a __________ design.

DrKnowles Wants to Assess the Effectiveness of Ritalin,a Drug Used