Dr Kenji Wants to Determine Whether His New Phonics Program

Multiple Choice

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. The confounding variable in this research design is:

A) The grade the students are in
B) The phonics program
C) The reading comprehension scores
D) Not giving one group the program