B
Explanation:
Developed in the 20th century as people began to live longer and have fewer children
Answer:
This is called cluster sampling procedure.
Explanation:
In this type of procedure, a group of elements is considered instead of individual units. This proceddure is usually based on geography, and it's useful due to its efficiency regarding cost and time.
There are a few disadvantages, though: it might not be diverse enough to be significant, and it's possible that some elements of other groups (in this case, other districts) share some features.
That's a ration like 4 out of 1 or 1 out of 4
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well some people are saying that they need to forbid it from texas. and i think so too cause my family lives out there
