Experimental Design With Blocking
A researcher is designing an experiment to compare the effectiveness of three teaching methods using a group of 60 students. To control for prior knowledge as a potential confounding variable, which of the following is the most appropriate experimental design?
A
Observational study with stratified sampling
B
Completely randomized design without blocking
C
Randomized block design with blocking by pretest scores
D
Matched pairs design with three treatments
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