Which of these statements about variables is true?
A. A variable must always be very concrete and straightforward.
B. A variable must always be as abstract as possible.
C. Research is often designed to discover how variables influence each other.
D. Only two variables may be included in any particular study.
Answer: C
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Indicate whether this statement is true or false.
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Jonathan Kozol criticizes the U.S. educational system for
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