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A researcher is determining the effectiveness of a new program intended to teach math more ...

A researcher is determining the effectiveness of a new program intended to teach math more effectively. The researcher tests the students’ abilities before and after beginning the school year, comparing the results to a demographically similar classroom that does not use the program. The students had to volunteer to take part in the program. What did the researcher neglect to control for?
a.   history.
b.   maturation.
c.   testing.
d.   selection biases.
e.   causal time-order.

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The Practice of Social Research

Edition: 13^th

Author: Babbie

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