In the Michelle Rhee IMPACT case, which control variable was the most important for minimizing the bias in estimates of teachers' impacts on students' test scores?

In the Michelle Rhee IMPACT case, which control variable was the most important for minimizing the bias in estimates of teachers' impacts on students' test scores?



A. Students' prior year test scores.
B. Students' current year test scores.
C. Students' poverty status.
D. Students' parental education levels.


Answer: A. Students' prior year test scores.


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