What is wrong with simply comparing the educational


Suppose you want to evaluate the effectiveness of vouchers in improving educational attainment by offering a voucher to any student in a particular town who asks for one.

What is wrong with simply comparing the educational performance of the students receiving vouchers with those who do not receive vouchers?

What would be a better way to study the effectiveness of vouchers?

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Business Law and Ethics: What is wrong with simply comparing the educational
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