A researcher evaluates an after-school math program by comparing pre- and post-test scores for participating students only. Under NCLB, why is this design weak?
-
A
The tests must be administered by an outside agency
-
B
Without a comparison group, gains cannot be attributed to the program rather than maturation or other factors
-
C
After-school programs are excluded from NCLB's research requirements
-
D
Pre/post designs are prohibited under NCLB