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Purpose of Blocking

APSTAT-8JNAYC

What is the essential purpose of blocking, and how should the blocks be designated?

A

Blocking reduces variability within the blocks; individuals within each block should be as similar as possible.

B

Blocking reduces measurement error; individuals should be self-selected in each block.

C

Blocking makes subjects more comfortable; subjects select their own groups.

D

Blocking increases the sample size, which in turn reduces variability; individuals within blocks should be as different as possible to create a more heterogeneous experiment.

E

Blocking reduces bias in experiments; individuals should be randomly divided into their blocks.