Question: An English professor wants to know if a reading program improves the speed at which children read. He gives them a reading exam before and

An English professor wants to know if a reading program improves the speed at which children read. He gives them a reading exam before and after the program which measures the time needed to read a certain passage.

He wants to know whether or not students' times decrease due to the program.

What is the explanatory variable in this study?

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