# What is the purpose of blocking in some experiments?

##### 1 Answer
Aug 2, 2015

If the variability is not known to be uniform, then we may use blocking to attain homogeneity within the blocks

#### Explanation:

In Design of Experiments it is assumed that the population variance is fixed at say,$\sigma$ , throughout the field of experimentation. It also lead to randomised Block designs from Simple random designs, this increases efficiency of the test procedure.