The National Capital Commission Recently Performed a Quality Check on the Length

The National Capital Commission recently performed a quality check on the length of fence posts being installed in a new park area. To do this, each of the 400 posts in inventory was numbered. Twenty numbers from 1 and 400 were randomly selected. These 20 poles were the ones selected for the study. This type of sampling is called

A) simple random.
B) convenience.
C) cluster.
D) stratified.
E) systematic.

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