Use the Following Description of a Controlled Experiment

question 4

Essay

Use the following description of a controlled experiment:
Two similar kindergarten classrooms, each containing 20- 25 students, have agreed to participate in a study to see if incorporating math manipulatives into the teacher's lesson improves understanding of new concepts in geometry, like recognizing shapes and similarities in shapes. The teacher in one classroom gives a standard lesson without the use of manipulatives then gives a three- question quiz about the new geometry concepts that were taught. The teacher in the second classroom gives a geometry lesson that incorporates the use of math manipulatives. The same three- question quiz is given and the scores of the two classrooms are compared to see whether the use of math manipulatives improved quiz scores.
-Which features of a well- designed control experiment does this study have? Which features are missing?

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Definitions:

Extract

A substance obtained from a plant, animal, or mineral, often used for flavoring or in medicine.

Sell

The act of giving something in exchange for money.

Extraction Costs

The expenses associated with the removal of natural resources from the earth, such as mining for minerals or drilling for oil.

Nonrenewable Resource

A natural resource that cannot be replaced once it has been used or is not replenished in a short period of time, such as fossil fuels and minerals.