Given the definitions of
blocking is the arranging of experimental units in groups (blocks) that are similar to one another
replication experiment is typically performed by obtaining test results on 20 samples of the same material and then calculating the mean, standard deviation, and coefficient of variation
randomized experiments are the experiments that allow the greatest reliability and validity of statistical estimates of treatment effects
in Control Experiment all variable factors have been kept constant and which is used as a standard of comparison to the experimental component in a controlled experiment
since
the sampling group could be either in group a or b (aspirin or placebo)
this expample is a blocking experiment
Correct answer
option A