A Researcher Studies the Relationship Between Early Reading and Later

Multiple Choice

A researcher studies the relationship between early reading and later school achievement. She decides that a potentially important extraneous variable is IQ. In developing her groups for her study, she pairs each child who was an early reader with a child of the same IQ level who was not an early reader. The control technique she used was:

A) Holding the extraneous variable constant
B) Statistical control
C) Matching
D) Random assignment