The reason that block designs are sometimes used in experimentation is to
A) prevent the placebo effect.
B) allow double-blinding.
C) reduce sampling variability.
D) eliminate sampling variability.

Question

Quizplus · Accepted Answer

Block designs are used to reduce sampling variability by creating homogeneous groups based on a known or suspected source of variability. This allows for more precise estimates of treatment effects by eliminating or reducing the variation caused by the blocked variable.

The Reason That Block Designs Are Sometimes Used in Experimentation