The sample for a telephone survey is selected by choosing 10 pages from the local phone directory using a table of random numbers,and then calling everyone on that page.Which type of sample is for this survey?
A Cluster sample
B Simple random sample
C stratified random sample
D systematic sample
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Answer:
(B) Simple Random Sample
Explanation:
Why Option A is wrong
- Cluster sampling is a probability sampling technique where researchers divide the population into multiple groups
Why Option B is correct
- A Simple random sample is a subset of a statistical population in which each member of the subset has an equal probability of being chosen.
And according to the case, the probability of a number being chosen from 10 pages from a table of random numbers is equally likely.
Why Option C is wrong
- Stratified random sampling is a method of sampling that involves the division of a population into smaller sub-groups known as strata
Why Option D is wrong
- Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random starting point but with a fixed periodic interval
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