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4. A school district wanted to assess the effectiveness of a new math readiness program for fifth graders. The school district is divided into the

4. A school district wanted to assess the effectiveness of a new math readiness program for fifth graders. The school district is divided into the individual fifth grade classrooms and 10 classrooms are randomly selected. All of the children in each of the 10 selected classrooms are assessed.

(a) What type of sampling method is being used?

(b) Please explain your answer.

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