Blocking would be unsuccessful if
A)not every element in the population were measured.
B)not every element in the sample was located.
C)the blocks were heterogeneous on the blocking factor.
D)the blocks were homogeneous on the blocking factor.
E)one experimental treatment was a placebo.

Question

Quizplus · Accepted Answer

The purpose of blocking is to reduce variability and eliminate the effects of extraneous variables. If the blocks are heterogeneous on the blocking factor, then the variability is not reduced and the blocking is not successful. Therefore, blocking would be unsuccessful if the blocks were heterogeneous on the blocking factor, as stated in choice C.

Blocking Would Be Unsuccessful If