Is the question complete. Cause it does not seem complete to me
Answer:
On the internet
Explanation:
The most advertisements I notice are pop-up messages on the internet. I spend a lot of time online, reading newspapers, buying things from online shops or chatting with friends.
I notice the advertisements there because they are very eye-catching. Their headlines are written in big, bold letters, aiming to catch the reader's attention. The headlines are also very interesting or thought-provoking, or offering a very good discount on products. It is difficult not to notice the advertisements on the internet as they are literary everywhere, even on social media where I spend a lot of time each day.
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.
Interest is what it is called
