The sampling interval would be 20, the correct option is B.
What is a Random Sampling?
It is a type of sampling technique in which each sample has an equal probability of being chosen.
The total number of residents in the building is 80.
Random sampling is done and the residents are interviewed.
The percentage of the residents that are being interviewed is 25%.
The sampling interval has to be calculated.
The sampling interval is given by = 25 % of 80
= 25 * 80 / 100
= 20
The number of residents that were interviewed is 20.
The sampling interval is 20 people.
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