Dr. Kenji wants to determine whether his new phonics program helps children's reading comprehension. He gives a fifth grade class the program and also studies a second grade class that does not go through the program
He finds that the fifth graders read with better comprehension. Identify the confounding variable in this research design.
a. the grade the students are in
b. the phonics program
c. reading comprehension scores
d. not giving one group the program
A
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